Supersedes Publication Num bers 36331-1
Seagate, Seagate Technology and the Seagate logo are registered
trademarks of Seagate Technology, Inc. Medalist is a trademark of
Seagate Technology, Inc. Other product names are trademarks or
registered trademarks of their owners.
Seagate reserves the right to change, without notice, product offerings
or specifications. No part of this publication may be reproduced in any
form without written permission from Seagate Tec hnology, Inc.
This manual describes the functional, mechanical and interface specifications for the Medalist 540sl, 851sl, 1080sl and 1270sl hard disc
drives. The drives are referred t o thr oughout th is manual by the ir model
numbers: ST5540A for the Medalist 540sl, ST5851A for the Medalist
851sl, ST51080A for the Medalist 1080sl and ST51270A for the M edalist
1270sl.
The drives combine features used in the Decathlon drives, such as Fast
ATA-2 capability, 5,376-RPM spindle speed, embedded servo and the
mini 3.5-inch footprint with new technology and more cost-efficient
design to provide high performance, high capacity, low noise, energy-efficiency and superior value.
The drives are designed to ensure fast data-throughput between the
drive and the host. Fast ATA-2 capability means that the drives support
PIO mode 4 and multiword DMA mode 2 and multiple block read/write.
When the host chooses PIO mode 4 or multiword DMA mode 2, the
drives respond with burst data-transfer rates of up to 16.6 Mbytes per
second. Multiple block read/write allows the drive to gather several
blocks of data in cache and transfers them in a single burst.
Other features the drives have that promote fast data-throughput include
embedded servo technology to ensure quick and accurate access to
information on the drive without thermal recalibration interruptions, a
16-bit internal microprocessor and an intelligent controller that provides
data streaming—direct data transfers between the host and the drive
without microprocessor intervention. These features increase the sustained data-transfer rate, facilitating video playback and other mu ltimedia
operations. Coupled with the 854-Mbyte capacity of the ST5851A, the
1.08-Gbyte capacity of the ST51080A and the 1.28 Gbytes of the
ST51270A (more than enough capacity to download a complete CDROM), these features make true mu ltimedia-ready drives.
The drives support the power modes defined in the ATA-2 standard.
Standby and Sleep modes reduce power consumption to a low 0.5 watt s
(typical). The drives enter power-saving modes at the request of the
computer and can be programmed to automatically enter Idle or Standby
modes. (A complete listing of the ATA commands the drives support is
found in the table on page 27. The ATA commands that have Seagateunique applications and the Seagate-unique commands the drives use
are discussed in Section 3.0 on page 25.)
The drives are designed for the standard 3.5-inch footprint but have a
slim 0.75-inch high (19-mm) profile and a shorter 5.0- inc h depth prof ile.
Even though the overall size of the drives is reduced, the top and bottom
mounting holes are placed in strict compliance with the SFF committee
standards for the 3.5-inch form-factor. This size reduction gives the
2Medalist SL Family Product Manual, June 1996
designer or integrator more room for air circu lation, other periphera ls or
a smaller drive bay. In addition, the smaller size and a redesigned top
cover have improved the acoustics for the 5,376-RPM drive. The idle
acoustic sound level is 30 dBA.
The following is a summary of the drives’ features:
Capacity
• 540, 854, 1,080 and 1,282 Mbytes formatted
• One-disc and two-disc formats
• LBA translation support
Performance
• Fast ATA-2. (Support s multiword DMA m odes 0, 1, 2 and P IO modes
0, 1, 2, 3 and 4 for up to 16.6-Mbyte-per-second transfer rates.
Supports multiple block read/write.)
• 5,376-RPM rotational speed
• 128-Kbyte segmented buffer
• 10.5-msec average seek time
• 16-bit microprocessor
• Data streaming
Energy efficiency
• Supports ATA-2 power-management modes: Active, Idle, Standby
and Sleep
• 0.5 watt typical power dissipation rating in Standby and Sleep modes
Acoustics
• 30-dBA idle acoustic sound level
Medalist SL Family Product Manual, June 19963
Quick specification chart
The following table serves as a quick reference of performance specifications for these drives. These and other specifications are discussed
in the Specification summary section following the table.
Guaranteed sectors1,058,400 1,669,248 2,116,8 002,504,880
Bytes per sector512512512 512
Logical cylinder s1,0501,6562,1002,485
Sectors per track63636363
Logical read/wri te he ads16161616
Physical read/write heads2444
Physical discs1222
Physical cylinders4,8344,8344,8345,414
Recording density (Kbits per inch)76.276.276.279.2
Track density (tracks per inch)4,8004,8004,8005,376
Internal data-transfer rate (Mbits per
sec max)
Spindle speed (RPM)5,376
Average latency (msec)5.58
Track-to-track seek time (msec t ypi-
cal)
Average seek time (msec typical)10.5
Full-stroke seek time (msec typical)20.0
Ext. transfer rate
PIO mode 4
Ext. transfer rate
DMA mode 2
Cache buffer (Kbytes)128
Height, inches max (mm)0.748 (19.0)
Width, inche s max (mm )4.01 (101.9)
Depth, inche s max (mm )5.01 (127.3)
Typical weight, lb (g)0.750 (340.2)
1
(Mbytes per sec)
1
(Mbytes per sec)
continued
6
541.9854.71,083.81,282.4
34.5 to
67.7
34.5 to
67.7
34.5 to
67.7
2.0
16.6
16.6
36.1 to
71.4
1. Externa l transfer rates are based on the ATA-2 standard. Actual performance may
exceed the standard. See your Seagate
Power-on to ready (sec typical)8
Spinup current (typical)1.1A
Seek power (typical)6.52W
Read/Write power and current
(typical)
Idle total power (typical)3.36W
Standby/Sleep total power (typical)0.71W
Voltage tolerance (including
noise): +5V
Voltage tolerance (including
noise): +12V
Operating temperature (°C)5° to 55°C
Nonoperating temperature (°C)–40° to 70°C
Operating temperature gradient
(°C per hour max)
Relative humidity, operating gradient
(max)
Altitude operating–1,000 to 10,000 ft.
Altitude nonoperating–1,000 to 40,000 ft.
Shock, normal operating (Gs max for
11 msec)
Shock, abnormal operating (Gs max
for 11 msec)
Shoc k, nonoperating (Gs max)75 Gs
Vibration (Gs max at 22–350 Hz with-
out nonrecoverable errors), operating
Vibration (Gs max at 22–350 Hz with
no physical damage incurred), nonoperating
Drive acoustics, Idle mode (dBA)30 dBA
Drive acoustics, seeking (dBA)34 dBA
Nonreco verab le read erro r s (per bits
transfe rred )
Mean time between failures (power-
on hours)
Contact start-stop cycles40,000
Service life (years)5
4.9W
±5%
±5%
20°C
10% per hour
2 Gs
10 Gs
0.75 Gs
0 to Peak
4 Gs
0 to Peak
13
10
300,000
Medalist SL Family Product Manual, June 19965
1.0Specifications
Unless otherwise noted, all specifications are measured under ambient
conditions, at 25° C, at sea level and nominal power.
1.1Formatted capacity
Medalist SL drives are low-level formatted at the factory. You cannot
low-level format them.
You can operate the drive using many different address configurations,
provided the number of sectors per track does not exceed 63. The
following tables show CHS and LBA translation geometries for the
standard configurations. You can verify the parameters using the Identify
Drive (EC
Seek time is the interval between the time the actuator begins to move
and the time the head is over the target track. Seek time is a true
statistical average of at least 10,000 measurements of seek time. All
measurements for maximum va lues are taken under nominal conditions
of temperature and voltage with the drive mounted horizontally.
3. See Figure 10 on page 37 for timing specificati ons.
4. See Figure 9 on page 36 for timing specificatio ns.
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