Seagate 6451, 6450 User Manual

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Medalist Pro Family

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Medalist Pro 6450 (ST36450A)

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Medalist Pro 6451 (ST36451A)

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ATA Interface Drives

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Product Manual

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Medalist Family

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Medalist Pro 6450 (ST36450A)

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Medalist Pro 6451 (ST36451A)

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ATA Interface Drives

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Product Manual

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© 1997 Seagate Technology, Inc. All rights reserved
Publication Number: 32652-001, Rev. B, June 1997
Seagate, Seagate Technology, the Seagate logo, Medalist and the

Medalist logo are registered trademarks of Seagat e Technology, Inc.
Other product names are trademarks or registered trademarks of their
owners.

Seagate reserves the right to change, wi thout notice, product of ferings
or specifications. No part of this publication may be reproduced in any
form without written permission from Seagate Technology, Inc.

Medalist Pro 6450/6451 Product Manual, Rev. B iii

Contents

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Quick specification chart . . . . . . . . . . . . . . . . . . . . . . 3

1.0 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.1 Formatted capacity . . . . . . . . . . . . . . . . . . . . . . 5

1.1.1 Standard configuration . . . . . . . . . . . . . . . . . . 5

1.2 Physical organization . . . . . . . . . . . . . . . . . . . . . 6

1.3 Functional specifications . . . . . . . . . . . . . . . . . . . 6

1.4 Physical dimensions . . . . . . . . . . . . . . . . . . . . . . 7

1.5 Seek time . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.6 Multisegmented cache buffer . . . . . . . . . . . . . . . . . 7

1.7 Start and stop times . . . . . . . . . . . . . . . . . . . . . . 8

1.8 Typical power-up and power-down sequence . . . . . . . . . 8

1.9 Power-up sequence . . . . . . . . . . . . . . . . . . . . . 9

1.9.1 Power-down sequence . . . . . . . . . . . . . . . . . . 9

1.10 Auto-park . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

1.11 Power specifications . . . . . . . . . . . . . . . . . . . . . 9

1.11.1 Power management . . . . . . . . . . . . . . . . . . . 9

1.11.2 Power consumption . . . . . . . . . . . . . . . . . 11

1.12 Input noise . . . . . . . . . . . . . . . . . . . . . . . . . 11

1.13 Environmental specifications . . . . . . . . . . . . . . . . 11

1.13.1 Ambient temperature . . . . . . . . . . . . . . . . . 11

1.13.2 Temperature gradient . . . . . . . . . . . . . . . . . 12

1.13.3 Altitude . . . . . . . . . . . . . . . . . . . . . . . . 12

1.13.4 Relative humidity . . . . . . . . . . . . . . . . . . . 12

1.14 Shock and vibration . . . . . . . . . . . . . . . . . . . . 12

1.15 Acoustics . . . . . . . . . . . . . . . . . . . . . . . . . . 13

1.16 Reliability . . . . . . . . . . . . . . . . . . . . . . . . . . 13

1.17 Agency listings . . . . . . . . . . . . . . . . . . . . . . . 13

1.18 Electromagnetic Compliance for the European Union . . . 14

iv Medalist Pro 6450/6451 Product Manual, Rev. B

1.19 FCC verification . . . . . . . . . . . . . . . . . . . . . . 14

2.0 Configuring and mounting the drive . . . . . . . . . . . . . 17

2.1 Handling and static-discharge precautions . . . . . . . . . 17

2.2 I/O cable and connector. . . . . . . . . . . . . . . . . . . 18

2.3 Power connector . . . . . . . . . . . . . . . . . . . . . . . 18

2.4 Options jumper block . . . . . . . . . . . . . . . . . . . . 19

2.4.1 Master/slave configuration . . . . . . . . . . . . . . 20

2.4.2 Alternate capacity jumper . . . . . . . . . . . . . . . . 21

2.4.3 Cable-select option . . . . . . . . . . . . . . . . . . . 21

2.4.4 Remote LED connection . . . . . . . . . . . . . . . . 21

2.5 Mounting the drive . . . . . . . . . . . . . . . . . . . . . . 22

3.0 ATA interface . . . . . . . . . . . . . . . . . . . . . . . . . 25

3.1 ATA Interface connector pin assignments . . . . . . . . . . 25

3.2 Command set . . . . . . . . . . . . . . . . . . . . . . . . 27

3.2.1 Identify drive command (EC

3.2.2 Set Features command (EF

. . . . . . . . . . . . . 29

H)

) . . . . . . . . . . . . . 32

H

3.2.3 Standby timer timeout period . . . . . . . . . . . . . . 34

3.2.4 Sleep command (99

, E6H) . . . . . . . . . . . . . . 34

H

3.2.5 Automatic Reallocation . . . . . . . . . . . . . . . . . 34

3.3 Synchronous DMA Transfer . . . . . . . . . . . . . . . . . 35

3.3.1 Signal Line Definitions . . . . . . . . . . . . . . . . . . . 35

3.3.2 Protocol Rules . . . . . . . . . . . . . . . . . . . . . 35

3.3.3 Error Register . . . . . . . . . . . . . . . . . . . . . . 36

Appendix. Timing diagrams . . . . . . . . . . . . . . . . . . 37

Medalist Pro 6450/6451 Product Manual, Rev. B v

Figures

Figure 1. Typ i cal startup cur rent profile . . . . . . . . . . . . . . . . 8

Figure 2. ATA interface connector . . . . . . . . . . . . . . . . . 18

Figure 3. Connectors . . . . . . . . . . . . . . . . . . . . . . . . 19

Figure 4. Configuration settings . . . . . . . . . . . . . . . . . . . 20

Figure 5. Connecting cable-selected drives . . . . . . . . . . . . . 22

Figure 6. Mounting dimensions . . . . . . . . . . . . . . . . . . . 23

Figure 7. ATA interface connector pin assignments . . . . . . . . 26

Figure 8. Programmed I/O timing without IORDY . . . . . . . . . . 37

Figure 9. Programmed I/O timing with IORDY . . . . . . . . . . . 38

Figure 10. Multiword DMA timing . . . . . . . . . . . . . . . . . . 39

Figure 11. Sustained synchronous DMA burst . . . . . . . . . . . 40

vi Medalist Pro 6450/6451 Product Manual, Rev. B

Medalist Pro 6450/6451 Product Manual, Rev. B 1

Introduction

This manual describes the functional, mechanical and interface specifi­cations for the Medalist

®

Pro 6450 and the Medalist Pro 6451 hard disc
drives. The drives are referred to throughout this manual by their model
numbers, ST36450A for the Medalist Pro 6450 and ST36451A for the
Medalist Pro 6451.

Seagate

®

desktop products take a step into the future with the ST36450A
and ST36451A. These drives feature MR heads and PRML recording
technology, Fast ATA-2 and Ultra ATA performance, segmented cache,
embedded servo technology, low noise and power management

The ST36450A and the S T36451A each c ontain five discs. These dr ives
use MR heads and PRML technology that provide the drives with
increased areal density. This means that more data can be stored on
each disc.

The ST36450A supports Fast ATA-2 technology and provides burst
transfer rates of up to 16.6 Mbytes per second. The ST36451A supports
Ultra ATA technology and provides burst-transfer r ates of up to 33.3
Mbytes per second. Both drives support PIO mode 4, multiword DMA
mode 2 transfer modes and multiple block read/write. The multiple block
read/write feature allows the drives to store several blocks of data in
cache and to transfer them in a single burst.

These drives use a 512-Kbyte segmented cache. Segmenting the cache
provides a designated area where blocks of contiguous read or write data
can be staged for transfer in a single burst.

The ST36450A and ST36451A drives hav e other features that ensure
fast data throughput. Embedded servo technology allows the drives to
position the heads for data retrieval efficiently and accurately while
eliminating the periodic thermal recalibration t hat can interrupt during
data transfers. These drives also use a 16-bit microprocessor and an
intelligent controller t hat provides data streaming: direct data transfers
between the drive and the host without microprocessor intervention.
These features allow for a sus tained data-transfer rate that facilitates
video-playback and other multimedia operations.

These drives support Active, Idle and Standby power-management
modes. Power-saving modes can be controlled by the computer.
Standby mode reduces power consumption to 2 watts (typical) while
retaining drive accessibility.

2 Medalist Pro 6450/6451 Product Manual, Rev. B

The ATA commands with specific applications for these drives and the
Seagate-unique commands the drives use are discussed in Section 3.0
on page 25. A complete list of the commands the drives support are found
in the table on page 27.

The following is a summary of the drives’ features:

Capacity

• 6.4 Gbytes formatted

• LBA translation support

• Av ailable software driver that surpasses the 528-Mbyte barrier and

4,096 cylinder barrier limited by some system BIOSs

• Av ailable software driver that provides expanded 32-bit disk access
support for Windows 3.

Performance

• Fast ATA -2 (ST36450A) —burst transfer rates up to 16.6-Mbytes-per­second

• Ult ra ATA (ST36451A)—burst transfer rates up to 13.3-Mbytes-per­second

• Supports DMA mode 2, PIO mode 4 and multiple block read/write.

x

• 512-K byte segmented buffer

• 12-msec average read seek time

• 13. 5-msec average write seek time

• Data streaming

Energy-efficiency

• Activ e, Idle and Standby power-management modes

• 2 watt typical power dissipation rating in Standby mode

Medalist Pro 6450/6451 Product Manual, Rev. B 3

Quick specification chart

The following table serves as a quick reference for the drives’ perform­ance specifications. These and other specifications are discussed in
“Specifications” on page 5.

Drive specification

9

Guaranteed capacity (Gbytes) (x10
Guaranteed sectors 12,594,960 12,594,960
Bytes per sector 512 512
Sectors per track 63 63
Logical read/write heads 15 15
Logical cylinders 13,328 13,328
Physical cylinders 6,536 6,536
Physical read/write heads 10 10
Physical discs 5 5
Areal density (Mbits per square inch) 928.8 928.8
Data zones 19 19
Recording density (bits per inch) 138,011 138,011
Track density (tracks per inch) 6,730 6,730
Spindle speed (RPM) 5,397 5,397
Track-to-track se ek time (msec typical) 2.0 2.0
Average read seek time (msec typical) 9.5 9.5

bytes) 6.4 6.4

ST36450A ST36451A

Average write seek time (msec typical) 10.0 10.0
Full-stroke seek time (msec typical) 20 20
Average latency (msec) 5.58 5.58
Internal data-transfer rate

(Mbits per sec max) 63 to 116 63 to 116
External transfer rate (Mbytes per sec max) 16.6 33.3
Cache buffer (Kbytes) 512 512
ECC on-the-fly (bits) 65 65

continued

4 Medalist Pro 6450/6451 Product Manual, Rev. B

continued from previous page

Drive specification

ST36450A ST36451A

Height (inches max) 1.027 1.027
Width (inches max) 4.023 4.023
Depth (inches max) 5.787 5. 787
Typical weight (lb) 1.5 1.5
Spinup current (max) 3.0A 3.0A
Seek power (typical) 9.8W 9.8W
Read/Write power and current (typical) 7.8W 7.8W
Idle total power (typical) 7. 8W 7.8W
Standby/Sleep total power (typical) 2.0W 2.0W
Voltage tolerance (including noise): +5V ± 5% ± 5%
Voltage tolerance (including noise): +12V ± 5% ± 5%
Operating temperature (°C) 5 to 55°C 5 to 55°C

Medalist Pro 6450/6451 Product Manual, Rev. B 5

1.0 Specifications

1.1 Formatted capacity

Medalist Pro drives are low-level formatted at the factory. You cannot
low-level format them.

These drives support cylinder-head-sector (CHS) and logical-bloc k ad­dressing (LBA) translation modes. You can use the Identify drive (EC
command to verify the address modes the drives support, the number of
cylinders, secto rs per track, total num ber of sectors, h eads and other p arame­ters. The Identif y drive paramet ers are listed in Sec tion 3.2.1 on pag e 29.

.

Notes:

DOS cannot access more than 2.147 Gbytes per partition.You

1.

must create multiple partitions to access the drive’s full capacity.

One Mbyte equals one million bytes.

2.

If the system BIOS does not support more than 4,096 cylinders,

3.

it can cause the computer to hang during startup, or it can
truncate or wrap the cylinders. To resolve this issue, the system
BIOS needs to be modified: the cylinder register or variable must
be increased from 12-bits to 16-bits to accommodate more than
4,096 cylinders.

H

)

1.1.1 Standard configuration

ST36450A CHS LBA

Cylinders 13,328 
Heads 15 
Sectors 63 
Guaranteed sectors 12,594,960 12,594,960
Guaranteed capacity (Gbytes) 6.4 6.4

ST36451A CHS LBA

Cylinders 13,328 
Heads 15 
Sectors 63 
Guaranteed sectors 12,594,960 12,594,960
Guaranteed capacity (Gbytes) 6.4 6.4

6 Medalist Pro 6450/6451 Product Manual, Rev. B

1.2 Physical organization

ST36450A ST36451A

Read/write heads 10 10
Discs 5 5

1.3 Functional specifications

ST36450A ST36451A

Interface ATA-2 Ultra ATA
Recording method PRML (8/9 ) PRML (8/9)
External data burst transfer rate:

PIO mode 4 (Mbytes per sec)
DMA mode 2 (Mbytes per sec)
Synchronous DMA mode 2

Internal data-transfer rate
(Mbits per sec)

Spindle speed (RPM) 5,397 ± 0.5% 5,397 ± 0.5%
Cache size (Kbytes) 512 512
Logical cylinders 13,328 13,328
Physical cylinders 6,536 6,536
Bytes per sector 512 512
Areal density (Mbytes/sq. in) 928.8 928.8
Data zones 19 19
Recording density, max (BPI) 138,011 138,011
Track density (TPI) 6,730 6,730

16.6

16.6
––

63 to 116 63 to 116

16.6

16.6

33.3

See Figure 8 on page 37 and Figure 9 on page 38 for PIO timing

Note.

specifications. See Figure 10 on page 39 and Figure 11 on page
40 for DMA timing specifications

.

Medalist Pro 6450/6451 Product Manual, Rev. B 7

1.4 Physical dimensions

The mounting dimensions are shown in Figure 6 on page 23.
Height, max 1.027 inch (26.09 mm)

Width, max 4.025 inches (102.2 mm)
Depth, max 5.787 inches (146.99 mm)
Weight 1.5 lb (0.68 Kg)

1.5 Seek time

Seek value is the interval between the time the actuator begins to move
and the time the head has settled over the target track. Seek time is a
true statistical average of at least 10,000 measurements of seek time.
All measurements are taken under nominal conditions of temperature
and voltage with the drive mounted horizontally. The specifications in the
table below are defined as follows:

• Track -to-track seek time is the average of all possible s ingle-track
seeks in both directions.

• Average seek time is measured by executing seeks in both directions
between random cylinders.

• Ful l-stroke seek time is half the time needed to seek from track 0 to
the maximum track and back to track 0.

Track-to-track
seek time (typ)

2.0 msec seek

2.5 msec read

3.5 msec write
Host overhead varies between systems and cannot be specified.

Note.

Drive internal overhead is measured by issuing a no-motion seek.
Overhead is typically less than 0.5 msec.

Average/typical
seek time

9.5 msec read

10.0 msec write

Full-stroke
seek time (typ)

20.0 msec seek

22.0 msec read

23.5 msec write

Average
latency

5.58 msec

1.6 Multisegmented cache buffer

The Medalist Pro ST36450A and ST36451A drives are available with a
512-Kbyte, multisegmented cache buffer that improves performance by
reducing access times.

Read look-ahead.

logical sectors, after the last requested sector, into a buffer befor e the
computer requests the additional sectors. The c ache buffer stor es data

The drive uses the read segments to store additional

8 Medalist Pro 6450/6451 Product Manual, Rev. B

from the start of a read until the buffer segment is full or until another
command is received.

Write immediate.

The drive uses the write segment to store write
commands and data. After the drive receives all of the data for the
command, it issues a write complete. Then, the drive writes the data to
the disc.

Write merging.

The drive accepts contiguous write commands and

executes them as one command.

1.7 Start and stop times

Within 20 seconds after power is applied, the drive is ready. Within 15
seconds after power is removed, the drive spindle stops rotating.

1.8 Typical power-up and power-down sequence

This section describes typical power-up and power-down sequences to
assist you in evaluating the dri ve’s performance. They are not perform­ance specifications. A typical startup current profile is shown in Figure 1.
Startup current profiles are unique for each drive.

Current (Amps)

3.5

3.0

2.5

2.0

1.5

1.0

0

0



Figure 1. Typical startup current p rofi l e

4

2

6

8

10

Time (seconds)

12

14

16

18

Medalist Pro 6450/6451 Product Manual, Rev. B 9

1.9 Power-up sequence

Power is applied to the drive.

1.

When power is applied, the LED stays on for about 1 second.

2.

The spindle motor reaches operating speed in about 4 seconds.

3.

The magnetic actuator-lock releases the actuator.

4.

The drive achieves final speed-control lock.

5.

The heads position over track 0 and the drive is ready.

6.

1.9.1 Power-down sequence

Caution.

The power is turned off.

1.

Within 15 seconds, the drive spindle stops rotating.

2.

The read/write heads automatically move to the landing zone, which

3.

is inside the maximum data cylinder.
The magnetic actuator-lock mechanism locks the arm. This completes

4.

the power-down sequence.

Do not move the drive until the motor has come to a complete
stop.

1.10 Auto-park

During power-down, the read/write heads automatically move to the
landing zone. The heads park inside the maximum data cylinder and the
magnetic actuator-lock engages. When power is applied, the heads
recalibrate to track 0.

1.11 Power specifications

1.11.1 Power ma nagement

The drive supports Active, Idle and Standby power-management modes.
The power-management commands the drive supports are listed in the
table on page 27. The table on page 11 shows the typical power
consumption rates for each power-management mode. The test criteria
for each mode is defined below. The Idle and Standby timers are disabled
at the factory.

10 Medalist Pro 6450/6451 Product Manual, Rev. B

All measurements were taken at t he dr ive power c onnector. A true RMS
meter is used to measure all modes except Standby. A DMM is used for
Standby measurements.

1.11.1.1 Active mode

During the Active mode, the drive is involved in spinup, seeking or
read/write activities. The table on page 11 shows the typical power-con­sumption rates for these activities.

•

Spinup.

and brings the spindle and discs up to operating speed. Power in this
mode is defined as the peak power after starting spinup.

•

Seek.

read/write heads are moved to a specific location on the disc surface
in preparation for reading from or writing to the disc. Read/write
electronics are powered down but servo electronics are active. Typical
power is defined as the power average of executing random seeks
with a 2-revolution (22.2 msec) dwell between Seek commands.

•

Read/write.

electronics are activated and t he servo is on track. The driv e reads
from or writes to the disc.

The drive enters the Spinup mode from the Standby mode

The drive enters the Seek mode from the Idle mode. The

Read/write mode is entered from Idle mode. Read/write

1.11.1.2 Idle mode

The Idle mode is entered 1 minute after the last disc I/O act ivity. The
motor is up to speed and the actuator is repositioned once every minute.
This mode uses an algorithm that minimizes head media interface
stresses. The drive can enter Idle mode from either Active or Standby mode.

1.11.1.3 Standby mode

The spindle is stopped, t he heads are parked in the landing zone, the
actuator is latched and some of the drive electronics are powered down.

When recovering from Standby or Sleep mode, you must allow

Note.

the drive to post ready before reporting a timeout. The drive can
take up to 20 seconds to post ready. In a master and slave
configuration, the master can wait up to 31 seconds for the slave
to complete diagnostics before posting ready.

1.11.1.4 Sleep mode

The sleep mode implementation is the same as in Standby mode.

Medalist Pro 6450/6451 Product Manual, Rev. B 11

1.11.2 Power consumption

In the table below, the values apply at the drive power connector. Current
was measured with an RMS DC ammeter.

Read/

Spinup Seek

Current at +12V

write Idle Standby

Amps max
RMS amps typ
Watts typ

Current at +5V

RMS amps typ
Watts typ

Power

Total watts typ

1.12 Input noise

Voltage tolerance
(including noise)

Input noise frequency
(max)

Input noise
(max, peak-to-peak)

3.0A — — — —
— 0.68 0.50 0.50 0.02
— 8.1 6.0 6.0 0.25

— 0.36 0.36 0.36 0.35
— 1.8 1.8 1.8 1.75

— 9.8W 7.8W 7.8W 2.0W

+5V +12V

± 5% ± 5%

25 MHz 25 MHz

100 mV 240 mV

1.13 Environmental specifications

1.13.1 Ambient temperature

Operating
Nonoperating –40° to 70°C (–40° to 158°F)

The system must provide sufficient airflow to maintain a

Note.

surface temperature of the aluminum base below 60°C.

5° to 55°C (41° to 122°F)

12 Medalist Pro 6450/6451 Product Manual, Rev. B

1.13.2 Tem per at ur e grad ien t

Operating 20°C per hour (36°F per hour)
Nonoperating 25°C per hour (45°F per hour)

1.13.3 Altitude

Operating –1,000 ft. to 10,000 ft. (–305 m to 3,048 m)
Nonoperating –1,000 ft. to 40,000 ft. (–305 m to 12,192 m)

1.13.4 Relative humidity

Operating 8% to 80% noncondensing

Maximum wet bulb 29.4°C (85°F)

Maximum operating
gradient

Nonoperating 5% to 95% noncondensing

10% per hour

Maximum wet bulb 35°C (95°F)

1.14 Shock and vibration

All shock and vibration specifications apply when the drive is mounted
as recommended in Section 2.5 on page 22, with the input levels
measured at the drive mounting screws. Shock measurements are based
on an 11 msec, half sine wave shoc k pulse, not to be repeated m ore than
twice per second.

During normal operating shock and vibration, there is no phys ic al dam­age to the drive or performance degradation. During nonoperating shock
and vibration, the read/write heads are positioned in the landing zone.

During abnormal operating shock and vibration, there is no physical
damage to the drive, although performance may be degraded during the
shock or vibration episode. When normal operating shock levels resume,
the drive meets its performance specifications.

Operating Abnormal Nonoperating

Shock 2 Gs 10 Gs 75 Gs
5–22 Hz vibration 0.020- inch

displacement

22–350 Hz vibration 0.50 Gs — 2.00 Gs

—

0.081-inch
displacement

Medalist Pro 6450/6451 Product Manual, Rev. B 13

1.15 Acoustics

This table shows the overall A-weighted acoustic sound power and sound
pressure levels for the drives. All measurements are generally consistent
with ISO document 7779. Acoustic measurements are taken under
essentially free-field conditions over a reflecting plane. The drive is
oriented with the top cover up for all tests.

Overall A-weighted Value Idle Seek

Sound power, typ (bels) 3.6 4.3
Sound power, max (bels)
Sound pressure, typ (dBA) 30 34

Sound pressure, max (dBA) 33 34

4.0 4.4

1.16 Reliabilit y

Read error rates are measured with automatic retries and data correction
with ECC enabled and all flaws reallocated. The mean time between
failures (MTBF) is measured at nominal power at sea level and an
ambient temperature of 25°C.

Nonrecoverable read errors 1 per 10
Seek errors 1 per 10
Contact start/stops 30,000 cycles
MTBF 300,000 power-on hours
Service life 5 years

13

bits transferred

7

physical seeks

1.17 Agency listings

This drives are listed by agencies as follows:

• Recognized in accordance with UL478 and UL1950

• Certified to CSA C22.2 No. 220-M1986 and CSA C22.2 No. 950

• Certified to VDE 0805/05.90 and EN 60950/1.88 as tested by VDE

14 Medalist Pro 6450/6451 Product Manual, Rev. B

1.18 Electromagnetic Compliance for the European
Union

If this model has the CE Marking, it complies with the European Union
requirements of the Electromagnetic Compatibility Directive 89/336/EEC
of 03 May 1989 as amended by Directive 92/31/EEC of 28 April 1992
and Directive 93/68/EEC of 22 July 1993.

Seagate uses an independent laboratory to confirm compliance to the
above directives. The drive was tested in a representative system for
typical applications. T he selected system r epresents the most popular
characteristics for test platforms. The system configurations include:

• 486, Pentium, and PowerPC microprocessors

• 3. 5-i nch floppy disc drives

• Key board

• Monitor/display

Although the test system with this Seagate model complies to the
directives, we cannot guarantee that al l systems will comply. The com­puter manufacturer or system integrator shall c onfirm EMC compliance
and provide CE Marking for their product. The drive is not meant for
external use (without properly des igned enclosure, shielded I/O cable,
etc.) and that a terminator should be used on all unused I/O ports.

1.19 FCC verification

The Medalist Pro ATA interface drives are intended to be contained solely
within a personal computer or similar enclosure (not attached to an
external device). As such, a drive is considered to be a subassembly
even when individually marketed to the customer. As a subassembly, no
Federal Communications Commission authorization, verification or cer­tification of the device is required.

Seagate Technology, Inc. has tested these drives in an enclosure as
described above to ensure that the total assembly (enclosure, disc
drives, motherboard, power supply, etc.) does comply with the limits for
a Class B computing device, pursuant to Subpart J of Part 15 of the FCC
rules. Operation with noncertified assemblies is likely to result in interfer­ence to radio and television reception.

Radio and television interference. This equipment generates and uses
radio frequency energy and, if not installed and used in strict accordance
with the manufacturer’s instructions, may cause interference to radio and
television reception.

This equipment is designed to provide reasonable protection against

Medalist Pro 6450/6451 Product Manual, Rev. B 15

such interference in a residential installation. However, there is no
guarantee that interference will not occur in a particular installation. If this
equipment does cause interference to radio or television, which can be
determined by turning the equipment on and off, you are encouraged to
try one or more of the following corrective measures:

• Reorient the receiving antenna.

• Move the device to one side or the other of the radio or TV.

• Move the device farther away from the radio or TV.

• Plug the equipment into a different outlet so that the receiver and

computer are on different branch outlets.

If necessary, you should consult your dealer or an experienced radio/tele­vision technician for additional suggesti ons. You may find helpful the
following booklet prepared by the Federal Communications Commission:

How to Identify and Resolve Radio-Television Interference Problems

This booklet is available from the Superintendent of Documents, US
Government Printing Office, Washington, DC 20402. Refer to publication
number 004-000-00345-4.

Note.

This digital apparatus does not exceed the Class B limits for radio
noise emissions from computer equipment as set out in the radio
interference regulations of the Canadian Department of commu­nications.

Le présent appareil numérique n′émet pas de bruits radioélectri-
ques dépassant les limites applicables aux appareils numériques
de Classe B prescrites dans le règlement sur le brouillage ra­dioélectrique édicté par le Ministère des Communications du
Canada.

.

16 Medalist Pro 6450/6451 Product Manual, Rev. B

Sicherheitsanleitung

Das Gerrät ist ein Einbaugerät, das für eine maximale Umgebung-

1.

stemperatur von 50°C vorgesehen ist.
Zur Befestigung des Laufwerks werden 4 Schrauben 6-32 UNC-2A

2.

benötigt. Bei seitlicher Befestigung darf die maximale Länge der
Schrauben im Chassis nicht mehr als 5,08 mm und bei Befestigung
an der Unterseite nicht mehr als 5,08 mm betragen.

Als Versorgungsspannugen werden benötigt:

3.

+5V æ 5% 0.55A
+12Væ 5% 0.35A (2. 0A fur ca . 30 Sek. fur ± 10%)

Die Versorgungsspannung muss SELV entsprechen.

4.

Alle Arbeiten an der Festplatte dürfen nur von ausgebildetem Serv-

5.

icepersonal durchgeführt werden. Bitte entfernen Sie nic ht die Auf­schriftenschilder des Laufwerkes.

. Der Einbau des Laufwerkes muss den Anforderungen gemäss DIN

6

IEC 950 VDE 0805/05.90 entsprechen.

Medalist Pro 6450/6451 Product Manual, Rev. B 17

2.0 Configuring and mounting the drive

This section contains the specifications and instructions for configuring
and mounting the drive.

2.1 Handling and static-discharge precautions

After you unpack the drive, and before you install it in a system, be careful
not to damage it through mishandling. Observe the f ollowing standard
handling and static-discharge precautions:

Caution:

• Keep the drive in its static-shielded bag until you are ready to complete
the installation. Do not attach any cables to the drive while it is in its
static-shielded bag.

• Before handling the drive, put on a grounded wris t strap, or ground
yourself frequently by touching the metal chassis of a computer that
is plugged into a grounded outlet. Wear a grounded wrist strap
throughout the entire installation procedure.

• Handle the drive by its edges or frame only.

• The drive is extremely fragile—handle it with care. Do not press down

on the drive top cover.

• Always rest the drive on a padded, antistatic surface until you mount
it in the computer.

• Do not touch the connector pins or the printed circuit board.

• Do not remove the factory-installed labels from the drive or cover them

with additional labels. Rem oval voids the warranty. Some factory-in­stalled labels contain information needed t o service the driv e. Other
labels are used to seal out dirt and contamination.

18 Medalist Pro 6450/6451 Product Manual, Rev. B

2.2 I/O cable and connector

The drive uses a 40-pin, male I/O connector with two rows of twenty pins
each and a notch for keying. Pin 20 is removed for keying purposes. A
drawing of the I/O connector is shown in Figure 2. Pin 1 is located near
the 4-pin power connector when the I/O connector is mounted.

0.70 ± 0.010

0.100 ± 0.010

0.235 ± 0.025

pin 1

0.230 ± 0.003

0.025 ± 0.002

0.025

± 0.002

0.160

1.90

2.00

Figure 2. ATA inte rface connector

0.100 typ

0.070 ± 0.010

The table below lists recommended parts for the mating connector. You
can use equivalent parts.

Part Description 3M part number

Connector 40-pin 3M-3417-7000
Connector 40-pin 3M-3448-2040
Flat cable AWG28 (stranded) 3M-3365-40

To ensure the integrity of your data, use a 40-connector, nonshielded I/O
cable with a maximum length of 18 inches (46 centimeters).

2.3 Power connector

The drive uses a standard 4-pin, male power connector. We recommend
the following part number or their equivalents for the mating connector.

Part Description Part number

Connector Housing AMP 1-480424-0
Connector Pin (loose piece) AMP 60619-4
Connector Pin (reel) AMP 6117-4
Cable 18 AWG —

Medalist Pro 6450/6451 Product Manual, Rev. B 19

2.4 Options jumper block

The options jumper block (J5), shown in Figure 3, is used to configure
the drives for operation. It is the 8-pin dual header between the I/O
connector and the power connector. Pin 1 is l ocated next to the power
connector and is farthest from the printed circuit board. It accepts

0.1-inch jumpers. The options jumper block is used to:

• Configure the drive for single-drive operation.

• Conf igure the drive as the master with an ATA-compatible slave.

• Configure the drive as the slave.

• Configure the drive for alternate capacity.

• Configure the drive for cable select.

• I nstall a remote LED.

The jumper settings for these options are shown in Figure 4 on page 20.
The drive is shipped with a spare jum per att ached to pins 6 and 8. Use
this jumper to configure the drive.

Figure 3. Conne ct ors

Standard

power connector

3

1

4

2

+5V
+5V return
+12V return
+12V

Circuit board

Pin 1

(J5)

Pin 1

Interface
connector

20 Medalist Pro 6450/6451 Product Manual, Rev. B

Options jumper block (J5)

Spare
Jumper

One drive only

Drive is slave 


Master with an
ATA-compatible 
slave

Alternate Capacity 
(AC)

Cable select 


Remote LED
connection

1753

684

Figure 4. Confi gur at io n Set tings

2.4.1 Master/slave configuration

Use the following settings to configure the drive as a master or a slave.

One drive only.

operation. No jumpers are required for single-drive operation. The spare
jumper on pins 6 and 8 does not affect drive operation.

Drive as slave.
Drive as master with an ATA-compatible slave

pins 7 and 8.

Place a jumper on pins 5 and 6.

2

The drive is configured at the factory for single-drive

Circuit Board

. Place a jumper on

Medalist Pro 6450/6451 Product Manual, Rev. B 21

2.4.2 Alternate capacity jumper

This jumper lowers the drive capacity by setting the default translation to

4.092 cylinders. Some BIOSs that only auto-detect may require this

jumper. Place a jumper on pins 1 and 2 of the J5 options jumper block
to enable this option. When installing this jumper, you may need third­party partitioning software to achieve full capacity of the drive.

2.4.3 Cable-select option

Computers that use cable-select determine the master and slave drives
by selecting or deselecting pin 28, CSEL, on the interface bus. Master
and slave drives are determined by their physical position on the cable.

• The drive plugged into the I/O connector that carries the CSEL signal
is the master.

• The drive plugged into the I/O connector that does not carry the CSEL
signal is the slave.

To configure the drives for computers that use cable select:

• I nstall jum pers on pins 5 and 6 and pins 7 and 8 as shown in
Figure 4 on page 20.

• Connect the drives to the cable as shown in Figure 5 on page 22.

2.4.4 Remote LED connection

You can connect a remote LED to pins 3(–) and 4(+) of the options jumper
block (J5). Do not install a shunt jumper on these pins.

Because the jumper block uses a 0.1-inch connector, you may need to
replace the current connector. Use Seagate connector part number
10562-001 or an equivalent.

22 Medalist Pro 6450/6451 Product Manual, Rev. B

Slave

CSEL not carried
to pin 28 of
this connector

Master

Pin 28 grounded
at computer

Computer

Figure 5. Conne ct in g cabl e- selected drives

2.5 Mounting the drive

You can mount the drive in any orientation.
Use the set of mounting guidelines below that are appropriate to the type

of mounting holes used: either bottom mounting holes or side mounting
holes. Refer to Figure 6 on page 23 for mounting dimensions.

Bottom mounting holes.

bottom mounting holes as shown in Figure 6.

Caution.

Do not insert the bottom mounting screws more than

0.20 inches (6 turns) into the drive frame.

Side mounti ng holes.

available side mounting holes as shown in Figure 6. Use two mounting
holes on each side of the drive.

Caution.

Do not insert the side mounting screws more than 0.20
inches (6 turns) into the drive frame. If you use a screw that is
too long, you risk damaging the drive’s circuit board.

Insert four 6-32 UNC screws into the four

Use four 6-32 UNC screws in four of the six

Medalist Pro 6450/6451 Product Manual, Rev. B 23

[3]

C

[1]

A

[2]

H

K

G

D

F

B

J

[4] M

K

E

Notes.

[1]

Mounting holes three on each side, 6-32 UNC.
Max screw length into side of drive 0.15 in. (3.81
mm). Screw tightening torque 6.0 in-lb (0.675
NM) max with minimum thread engagement of

0.12 in. (3.05 mm).

Mounting holes four on bottom, 6-32 UNC. Max

[2]

screw length into bottom of drive 0.15 in. (3.81
mm). Screw tightening torque 6.0 in-lb (0.675 NM)
max with minimum thread engagement of 0.12 in.
(3.05 mm).

Power and interface connectors can extend past

[3]

the “A” dimension by 0.040 in. (1.02 mm).


[4]

Centerline of pad for Pin 1 of power connector.


[5]

Dimensions to Pin 1 of each connector are
nominal values.



Dimension Table

Inches

± 0.010

5.74 

A
B

C



D

E
F

G



H

J


K
L

M



± 0.010

4.00 
+ 0.021

1.00 

– 0.009



± 0.010

2.362

± 0.020

0.620

± 0.010

4.000

+ 0.010

0.250

– 0.005



± 0.010

1.750

± 0.010

3.750



± 0.010

1.00 

± 0.010

4.000

0.143

[5] [5]







Millimeters

145.80 

101.60 

25.40 

60.00 

15.75 

101.60 

6.35 

44.45 

95.25 

25.4 

101.6 

3.63

± 0.25
± 0.25

+ 0.53

– 0.22


± 0.25
± 0.50
± 0.25
+ 0.25
– 0.12


± 0.25
± 0.25



± 0.25
± 0.25







L

Figure 6. Mount i ng dimensions

24 Medalist Pro 6450/6451 Product Manual, Rev. B

Medalist Pro 6450/6451 Product Manual, Rev. B 25

3.0 ATA Interface

The drives use an ATA-3 interface. The interface complies with

ATA (AT Attachment) Interface X3T10 Rev. 6.0
Extension for Local Bus Attachments, Rev. 2. 0
drives Data for drives Under 8 GB

support are listed on pages 27 and 28. Commands and features with
specific applications for these drives are also discussed in this section.

The ATA interface consists of single-ended, TTL-compatible receivers
and drivers that use an asynchronous interface protocol. The drivers can
sink up to 24 mA and drive a load up to 300 pF. The integrity of the ATA
interface is affected by the interface cable. It is designed to support a
40-conductor, nonshielded interface cable with a maximum length of 18
inches (46 centimeters).

. The ATA commands that the drives

;

SFF 8011: ATA Timing

and SFF 8019:

ANSI

Identify

3.1 ATA Interface connector pin assignments

The signal name and signal direction for each I/O connector pin is shown
in Figure 7 on page 26. See the

Manual

each pin.
Signal names are shown in upper-case letters. If the signal name is

followed by a minus sign (–), the signal is active low. Otherwise, the signal
is active high.

, publication number 36111-

Seagate ATA Interface Reference

xxx

, for a complete description of

26 Medalist Pro 6450/6451 Product Manual, Rev. B

Drive

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33

*34

35
36
37
38

*39



40

*

Drive-to-drive signals

Reset–
Ground

DD7
DD8
DD6
DD9
DD5

DD10

DD4

DD11

DD3

DD12

DD2

DD13

DD1

DD14

DD0

DD15

Ground

(removed)

DMARQ

Ground
DIOW–
Ground
DIOR–
Ground
IORDY

CSEL

DMACK–

Ground
INTRQ

IOCS16–

DA1

PDIAG–

DA0

DA2
CS1FX–
CS3FX–

DASP–





Ground



Host

1

Host Reset

2

Ground

3

Host Data Bus Bit 7

4

Host Data Bus Bit 8

5

Host Data Bus Bit 6

6

Host Data Bus Bit 9

7

Host Data Bus Bit 5

8

Host Data Bus Bit 10

9

Host Data Bus Bit 4

10

Host Data Bus Bit 11

11

Host Data Bus Bit 3

12

Host Data Bus Bit 12

13

Host Data Bus Bit 2

14

Host Data Bus Bit 13

15

Host Data Bus Bit 1

16

Host Data Bus Bit 14

17

Host Data Bus Bit 0

18

Host Data Bus Bit 15

19

Ground
(No Pin)

20
21



DMA Request

22

Ground

23

Host I/O Write

24

Ground

25

Host I/O Read

26

Ground

27

I/O Channel Ready

28

Cable Select

29

DMA Acknowledge

30

Ground

31

Host Interrupt Request

32

Host 16 Bit I/O

33

Host Address Bus Bit 1

34

Passed Diagnostics

35

Host Address Bus Bit 0

36

Host Address Bus Bit 2

37

Host Chip Select 0

38

Host Chip Select 1

39

Drive Active/



Drive 1 Present

40

Ground


Drive 1

(slave)

28
34
39



NC

Drive 0

(master)

28
34
39

CSEL

PDIAG

DASP–

Figure 7. ATA inte rface connector pin assi gnm ent s

Host

–

28
34
39

Medalist Pro 6450/6451 Product Manual, Rev. B 27

3.2 Command set

This section lists all of the ATA commands the drives use. Only the
commands with unique implementation for the dri ves are discussed in
this manual. For information about the ATA interface, refer to

Draft X3T10.2008D Rev. 6, Information Technology—AT Attachment-3
Interface ATA-3

features is provided in the

36311-xxx
tember 18, 1993

. Additional information about the drive commands and

Seagate ATA Interface Reference Manual,

,

Small Form Factor Specification, SFF-8011 Rev 1.1, Sep-

, and

Small Form-Factor Committee Specification Draft

SFF-8055i, January 8,1996, Revision 1.0, Preliminary Document

The table below list s all commands that the drives us e. The following
abbreviations are used:

FR Features register
SC Sector Count register
SN Sector Number register
CY Cylinder register
DH Drive/Head register
n This register does not contain a valid parameter for this

command.

y This register contains a valid parameter for this command. In

the Drive/Head register, both the drive and head parameters
are valid for this command.

D The Drive/Head register contains a valid drive parameter for

this command. The head parameter is not valid for this
command.

Read DMA, Read Long, Read Sector, Read Verify Sector, Write

Note.

DMA, Write Long and Write Sector support with retry and without
retry commands.

Working

.

Command name

Active and Set Idle Timer FB n y n n D
Active Immediate F9 nnnnD
Check Idle Mode FD n y n n D
Check Power Mode 98, E5 n y n n D
Execute Drives Diagnostic 90 nnnnD

continued

Command

code (in hex)

Parameters used

FR SC SN CY DH

28 Medalist Pro 6450/6451 Product Manual, Rev. B

continued from previous page

Command name

Command

code (in hex)

Parameters used

FR SC SN CY DH

Identify drives EC nnnnD
Idle 97, E3 n y n n D
Idle and Set Idle Timer FA n y n n D
Idle Immediate 95, F8, E1 nnnnD
Initialize Drive Parameters 91 n y n n y
Read DMA C8, C9 — yyyy
Read Long 22, 23 n yyyy
Read Multiple C4 n yyyy
Read Sector 20, 21 n yyyy
Read Sector Buffer E4 nnnnD
Read Verify Sector 40, 41 n yyyy
Recalibrate 1X nnnnD
Seek 7X n n y y y
Set Features EF y n n n D
Set Multiple Mode C6 n y n n D
Sleep 99, E6 nnnnD
Standby 96, E2 nnnnD
Standby Immediate 94, E0 nnnnD
Write DMA CA, CB —yyyy
Write Long 32, 33 n yyyy
Write Multiple C5 n yyyy
Write Sector 30, 31 nyyyy
Write Sector Buffer E8 nnnnD

Medalist Pro 6450/6451 Product Manual, Rev. B 29

3.2.1 Identify drive command (ECH)

The Identify drive parameters for the drives are listed in the table below.

If the alternate capacity jumper is installed on the drive, the drive

Note.

capacity is reduced in Word 1 to 4,092 cylinders.

Word Description Value

0

Configuration 045A

H

1

2
3
4
5
6

7–9

10–19

20
21
22

23–26

27–46

47

Number of logical
cylinders

ST36450A = 13,328
ST36451A = 13,328

Reserved 0000
Number of logical heads 15
Vendor-specific 34,540
Vendor-specific 580
Number of logical sectors

63

per track
Vendor-specific 0000

Serial number (20 ASCII

drive-unique

characters)
Vendor-specific 3

Vendor-specific 896
ECC bytes (R/W Long) 0004
Firmware revision

H

drive-unique

(8 ASCII characters)
Model number (40 ASCII

characters)
Vendor-specific 8010

ST36450A
ST36451A

H

48
49
50
51

52

continued

Reserved 0000
Capabilities 0B01
Reserved 0000
PIO data-transfe r cycle

0200

timing mode
Obsolete 0200

H

H

H

30 Medalist Pro 6450/6451 Product Manual, Rev. B

continued from previous page

Word Description Value

53

Current valid

ST36450A

0003

H

0001H words 54–58 and
64–70 are valid
0007

ST36451A

words 54–58, 64–70

H

and 85–85 are valid

54

55

Number of current logical
cylinders

Number of current logical

ST36450A = 13,328
ST36451A = 13,328

15

heads

56

Number of current

63

sectors

57–58

59

Current capacity in
sectors (CHS)

xx

= Current setting for

H

number of sectors that

ST36450A = 12,594,960
ST36451A = 12,594,960

0000s

can be transferred per
interrupt on Read/Write
Multiple command

60–61

62

Total number of user­addressable LBA sectors

Obsolete 0000

ST36450A = 12,594,960
ST36451A = 12,594,960

63

64

65

66

67

Multiword DMA transfer
mode active

Advanced PIO transfer
mode supported

Minimum multiword DMA
transfer cycle time per
word

Manufacturer
recommended multiword
DMA transfer cycle time

Minimum PIO transfer
cycle time without flow
control

0107

H

Mode 0 is active
Modes 0, 1, and 2 supported

0003

H

Modes 3 and 4 supported
120 nsec

120 nsec

120 nsec

Medalist Pro 6450/6451 Product Manual, Rev. B 31

Word Description Value

68

Minimum PIO transfer

120 nsec

with IORDY flow control

69–79

Reserved 0000

80

81
82

83

84

85–86

87

88

89–127

128
129–159
160–255

Major version number 000E

H

supports ATA-3
supports ATA-2
supports ATA-1

Minor version number 0000
Command set support ST36450A = 0000

ST36451A = 7069

Command set support ST36450A = 0000

ST36451A = 4000

Command set/feature

0

supported extension
Command set/feature

0

enabled
Command set/feature

0

default
Ultra DMA mode ST36450A = 0000

ST36451A = 0007

Reserved
Security status 0000
Vendor-specific
Reserved

H

H

H

32 Medalist Pro 6450/6451 Product Manual, Rev. B

3.2.2 Set Features command (EFH)

The Set Features command (command code E FH) allows you to enable
and disable the multisegmented cache and Automatic Reallocation
features and to identify the transfer modes the drives use. The multiseg­mented buffer consists of Read Look-ahead and write-immediate and
write-merging features. The table below lists the features the drives
support. The features that are set to default by the factory are indicated
in the Feature column.

To use the command:

Write the Feature value to the Features register.

1.

Write the Set Features command to the command register.

2.

If the value in the Features register is not supported or is invalid,

Note.

the drives post an Aborted Command error.

At power-on or after a hard reset, the feature selections are r estored to
the factory-default values.

The table below shows alterable features that the drives support. Values
that are preset at the factory are indicated as default in the feature
description.

Feature Value Feature

Enable write cache (default)

02

H

03

04

55

82

84

AA

H
H
H
H
H

H

Set transfer mode
Enable Read Automatic Reallocation (default)
Disable read look-ahead cache
Disable write cache
Disable Read Automatic Reallocation
Enable read look-ahead cache (default)

Medalist Pro 6450/6451 Product Manual, Rev. B 33

3.2.2.1 PIO and DMA Data-Transfer Modes

You can set the multiword DMA mode and identify the PIO data-transfer
mechanism and transfer mode with the Set Features command. To set
the multiword DMA mode:

Write Set Features command value 03

1.1.

the Features register.
Write a transfer types value to the Sector Count register. The upper 5

2.

bits of this value define the type of data transfer, and the lower 3 bits
encode the mode value. This changes word 63 of the Identify Drive
command to the value you enter in the Sector Count register.

The following table identifies allowable transfer types values:

Data-Transfer Mechanism Transfer Types value

Mechanism name

PIO Transfer Mode (default) 2 00000 000
PIO Transfer Mode: Disable

IORDY Set PIO Mode = 2
PIO Flow Control Transfer

Mode: Set PIO Mode = 0
PIO Flow Control Transfer

Mode: Set PIO Mode = 1
PIO Flow Control Transfer

Mode: Set PIO Mode = 2
PIO Flow Control Transfer

Mode: Set PIO Mode = 3
PIO Flow Control Transfer

Mode: Set PIO Mode = 4)
Obsolete 00010
Multiword DMA Mode 0 00100 000
Multiword DMA Mode 1 00100 001
Multiword DMA Mode 2 00100 010
Synchronous DMA Mode 01000
Reserved — 10000

Mode

value

(Set Data Transfer mode) to

H

Data

Upper 5 bits

2 00000 001

0 00001 000

1 00001 001

2 00001 010

3 00001 011

4 00001 100

Lower 3 bits

nnn

nnn
nnn

If the drive does not support a commanded mode, it returns a 04

Note.

aborted command error.

34 Medalist Pro 6450/6451 Product Manual, Rev. B

3.2.3 Stand by tim er ti m eo ut pe ri od

The Idle command and Standby command Sector Count registers are
used to activate t he Standby timer. The host can enable the Standby
timer by placing a value in the sector-count register of the Idle command
or Standby command. The value corresponds to a predetermined period
of drive inactivity. The table below lists the values the Seagate drives use
and their corresponding timeout period.

Sector Count Register contents Corresponding timeout period

0 (0

) Timeout disabled

H

1–12 (1

) value = 60 seconds

H–CH

13–240 (DH–F0H) (value * 5) seconds
241–251 (F1
252 (FC
253 (FD
254 (FE

–FBH) (value – 240 * 30) minutes

H

) 21 minutes

H

) 8 hours

H

) Reser ved

H

255 (FFH) 21 minutes 15 seconds

The drives are shipped with the Standby timer disabled.

3.2.4 Sleep command (99H, E6H)

This command performs the same function as the Standby Immedi ate
command (94

, E0H).

H

3.2.5 Automatic Realloca tion

This feature allows the drive to identify grown media defects and to
reallocate the sector without host intervention using both Read and Write
Automatic Reallocation.

You can disable Read Reallocation by using the Set Features command
Disable Read Automatic Reallocation, feature value 84

. This feature is

H

not used for the Read Long command.
You can disable The Writ e Reallocation, in addition t o write cache by

using the Set Feature command Disable Write Cache, feature value 82

H.

This feature is not implemented for the Write Long command.

Medalist Pro 6450/6451 Product Manual, Rev. B 35

You can disable both the Write Reallocation and write cache using value
82

. These two features coexists as a pair and are enabled/disabled

H

together.

3.3 Synchronous DMA Tr ans fer

3.3.1 Signal Line D efi ni t io ns

Some existing ATA signal lines are redefined during the Synchronous
DMA protocol to provide new functions. If the Synchronous DMA transfer
mode was previously chosen by the Set Features, the ATA lines change
from the old to new definitions as soon as the host allows for a DMA
burst. The drive detects this change when the –DMACK line is asserted.
These lines revert back to their original definitions upon the de-assertions
of –DMACK at the termination of the DMA burst.

Signal Line Definitions

New Definitions Old Definitions

DMARQ DMARQ
–DMACK –DMACK
–DMACK IORDY on write commands

–DIOR on read commands

STROBE –DIOR on write commands

IORDY on read commands

STOP –DIOW

DMARQ and –DMACK signal lines remain unchanged. This en-

Note.

sures backward-compatibility with PIO modes.

3.3.2 Protocol Rules

The general rules of the Synchronous DMA Transfer Protocol are as
follows:

• A DMA burst is defined as the period from an assertion of –DMACK
to subsequent de-assertion of –DMACK.

• A r eceiver must be prepared to receive at least two words of data
whenever it enters or resumes a burst mode.

36 Medalist Pro 6450/6451 Product Manual, Rev. B

• During t he entire burst, –CS0, –CS1, and –IOCS16 are in the high
negated state. DA2, DA1 and DA0 are driven low.

• The drive begins driving and stops t ristating IORDY when –DMACK
is first asserted and SyncDMA is enabled. The drive must continue to
drive IORDY until –DMACK is de-asserted and then tristates IORDY
within (Tiordyz) nanoseconds.

• A device that supports a particular mode timing must support all slower
modes

3.3.3 Error Register

Field/Bit Description

Bit

• ICRCE (Interface CRC Error) indicates that a CRC error occurred on
the data bus during a S ynchronous DMA transfer. The correct re­sponse for this error is to retry the c ompl ete command. ABRT (bit 2)
is also set to ensure compatibility with drivers designed f or previous
versions of the Synchronous DMA Transfer Protocol Specification.

• AB RT (Aborted Command) indicates t hat the requested command
was aborted because the command code or a command parameter
was invalid, or some other error occurred. The device may complete
some portion of the command before setting ABRT and terminating
the command. If the command was a data-transfer command, the data
transfer is determinate. This bit is also set when an Interface CRC
Error (bit 7) occurs. This ens ur es c ompatibility with drivers designed
for previous versions of the Synchronous DMA Protocol Specification.

765432 1 0

ICRCE UNC MC IDNF MCR ABRT TKONF AMNF

Medalist Pro 6450/6451 Product Manual, Rev. B 37

Appendix. Timing diagrams

Without IORDY, the drives operate at programmed I/O timing specifica­tions, as shown below.

Address valid

DIOR− and DIOW−

Write data valid

Read data valid

IOCS16−

T7

T1

T2

Figure 8. Programmed I/O timing without IORDY

T5 T6

T3

T0

T4

T9 T8

Time Description Min Max

T0 Cycle time 200 nsec —

Drives address (CS1FX–, CS3FX–,

T1

30 nsec —
DA0, DA1 and DA2) valid and
DIOR– and DIOW setup

T2 DIOW– or DIOR– pulse width 80 nsec —
T3 DIOW– data setup 30 nsec —
T4 DIOW– data hold 15 nsec —
T5 DIOR– data setup 20 nsec
T6 DIOR– data hold 5 nsec —
T7 DIOW– or DIOR– to address valid hold — 40 nsec
T8 DIOW– false to write data hold — 30 nsec
T9 DIOR– false to read data hold 10 nsec

38 Medalist Pro 6450/6451 Product Manual, Rev. B

When using IORDY, the drives operate at programmed timing specifica­tions, as shown below.

Address valid

IOCS16−

DIOR− or DIOW−

IORDY

Write data valid

Read data valid

T1

T2

T3

Figure 9. Programmed I/O timing with IORDY

T5
T4

T0

T7
T6

T8
T9

T10

T11

Time Description Min Max

T0 Cycle time 120 nsec —
T1 Address valid until IOCS16– is asserted — 30 nsec

Drive address (CS1FX–, CS3FX–,

T2

25 nsec —
DA0, DA1 and DA2) valid before DIOR–
or DIOW– setup

T3 IORDY s e tu p ti me — —

DIOW– or DIOR– pulse width (8-bit) 70 nsec —

T4

DIOW– or DIOR– pulse width (16-bit) 70 nsec —

T5 IORDY pulse width —

1,250

nsec
T6 DIOW– data setup 20 nsec —
T7 DIOR– data setup 20 nsec —
T8 DIOR– data hold 5 nsec —
T9 DIOW– data hold 10 nsec —

T10 DIOW– or DIOR– to address valid hold 5 nsec —
T11 Address valid until IOCS16– is negated — 25 nsec

Medalist Pro 6450/6451 Product Manual, Rev. B 39

The drives operate at multiword DMA mode 2 timing specifications, as
shown below

DMARQ

DMACK−

DIOR− or DIOW−

Read data valid

Write data valid

TE

Figure 10. Multiword DMA timing

TF

TG

TH

TDTI TJ

TK

T0

TL

Time Description Min Max

T0 Cycle time 120 nsec —

TD DIOW– or DIOR– pulse width (16-bit) 70 nsec —

TE DIOR– data access — —

TF DIOR– data hold 5 nsec —
TG DIOW– data setup 20 nsec —
TH DIOW– data hold 10 nsec —

TI DMACK– to DIOR– or DIOW– setup 0 nsec —

TJ DIOR– or DIOW– to DMACK– hold 5 nsec —

DIOR– negated pulse width 25 nsec —

TK

R

TK

DIOW– negated pulse width 25 nsec —

W

TL

DIOR– to DMARQ delay — 35 nsec

R

TL

DIOW– to DMARQ delay — 25 nsec

W

40 Medalist Pro 6450/6451 Product Manual, Rev. B

The dives operates at sustained synchronous DMA burst timing specifi­cations, as shown below.

Strobe at 

Sender

Data at
Sender

Tdvs Tdvs

Tdvh

Strobe at 
Receiver

Data at

Receiver

Tdvh

Tcyc Tcyc

T2cyc

Tdvh

T2cyc

Tds

Tdh

Figure 11. Sustaine d Synchronous DMA burst

Tdh

Tds

Tdh

Time Description Mode 0 Mode 1 Mode 2

Tcyc Cycle time 114 nsec 75 nsec 55 nsec

T2cyc Two cycle times 235 nsec 156 nsec 117 nsec

Data setup time

Tds

(at receiver)
Data hold time

Tdh

(at receiver)

Tdvs

Tdvh

Note.

Data valid setup
time (at sender)

Data valid hold time
(at sender)

Mode values show the minimum time only.

15 nsec 10 nsec 7 nsec

5 nsec 5 nsec 5 nsec

70 nsec 48 nsec 34 nsec

6 nsec 6 nsec 6 nsec

Seagate Technology, Inc.
920 Disc Drive, Scotts Valley, California 95066, USA

Publication Number: 32652-001, Rev. B, Printed in USA