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PROVIDES THIS PUBLICATION "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
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Storage Technologies.
2OUTLINE OF THE DRIVE.....................................................................................................................................................13
PART 1 FUNCTIONAL SPECIFICATION ......................................................................................14
3FIXED DISK SUBSYSTEM DESCRIPTION.........................................................................................................................15
3.2Head disk assembly data ................................................................................................................................ 15
4FIXED DISK CHARACTERISTICS .......................................................................................................................................16
4.1Formatted capacity by model number ....................................................................................................... 16
5.1Data loss on power off ....................................................................................................................................... 22
5.5Data buffer test ...................................................................................................................................................23
6.2DC power requirements...................................................................................................................................27
6.5Vibration and shock...........................................................................................................................................34
9DEVIATIONS FROM STANDARD ........................................................................................................................................46
11.3 Device Control Register ...................................................................................................................................47
11.6 Features Register...............................................................................................................................................48
11.7 LBA High Register.............................................................................................................................................49
12.5 Power Management Feature .........................................................................................................................54
12.6 Advanced Power Management (Adaptive Battery Life Extender 3) Feature...........................56
12.7 Interface Power Management Mode (Slumber and Partial)................................ ............................57
12.10Protected Area Function .............................................................................................................................64
12.12Write Cache Function ..................................................................................................................................67
12.1448-bit Address Feature Set ........................................................................................................................68
12.15Software Setting Preservation Feature Set ........................................................................................69
13.1 Data In Commands................................ ............................................................................................................72
13.2 Data Out Commands ........................................................................................................................................72
14.29Security Erase Unit (F4h)........................................................................................................................129
14.35Set Features (EFh) ......................................................................................................................................137
14.36Set Max Address (F9h) ..............................................................................................................................139
14.37Set Max Address Ext (37h) ......................................................................................................................141
This document describes the specifications of the HITACHI Travelstar 5K320, a 2.5-inch hard disk
drive with Serial ATA interface:
Drive
name
Travelstar
5K320-320
Travelstar
5K320-250
Travelstar
5K320-160
Travelstar
5K320-120
Travelstar
5K320-80
Model Number Max data
transfer rate
(Gbps)
HTS543232L9A300 3.0
HTS543232L9SA00 1.5
HTS543225L9A300 3.0
HTS543225L9SA00 1.5
HTS543216L9A300 3.0
HTS543216L9SA00 1.5
HTS543212L9A300 3.0
HTS543212L9SA00 1.5
HTS543280L9A300 3.0
HTS543280L9SA00 1.5
Capacity
(GB)
320 9.5 5400
250 9.5 5400
160 9.5 5400
120 9.5 5400
80 9.5 5400
Height (mm) Rotation
speed (rpm)
1.1Abbreviations
Abbreviation Meaning
32 KB 32 x 1024 bytes
64 KB 64 x 1024 bytes
“ inch
A amp
AC alternating current
AT Advanced Technology
ATA Advanced Technology Attachment
Bels unit of sound power
BIOS Basic Input/Output System
°C degrees Celsius
CSA Canadian Standards Association
C -UL Canadian-Underwriters Laboratory
Cyl cylinder
DC direct current
DFT Drive Fitness Test
DMA Direct Memory Access
ECC error correction code
9
5K320 SATA OEM Specification
EEC European Economic Community
EMC electromagnetic compatibility
ERP Error Recovery Procedure
Esd electrostatic discharge
FCC Federal Communications Commission
FRU field replacement unit
G gravity, a unit of force
Gb 1 000 000 000 bits
GB 1 000 000 0 00 bytes
GND ground
h hexadecimal
HDD hard disk drive
Hz hertz
I Input
ILS integrated lead suspension
imped impedance
I/O Input/Output
ISO International Standards Organization
KB 1,000 bytes
Kbit/mm 1,000 bits per mm
Kbit/sq-mm 1000 bits per square mm
KHz kilohertz
LBA logical block addressing
Lw unit of A-weighted sound power
m meter
max. or Max. maximum
MB 1,000,000 bytes
Mbps 1,000,000 Bit per second
Mb/sec 1,000,000 Bit per second
MB/sec 1,000,000 bytes per second
MHz megahertz
MLC Machine Level Control
mm millimeter
ms millisecond
us, ? s microsecond
Nm Newton meter
No. or # number
oct/min oscillations per minute
O Output
10
5K320 SATA OEM Specification
OD Open Drain Programmed Input/Output
PIO Program I/O
POH power on hours
Pop. population
P/N part number
p-p peak-to-peak
PSD power spectral density
RES radiated electromagnetic susceptibility
RFI radio frequency interference
RH relative humidity
% RH per cent relative humidity
RMS root mean square
RPM revolutions per minute
RST reset
R/W read/write
sec second
Sect/Trk sectors per track
SELV secondary low voltage
S.M.A.R.T Self-monitoring, analysis, and reporting technology
Trk. track
TTL transistor-transistor logic
UL Underwriters Laboratory
V volt
VDE Verband Deutscher Electrotechnik er
W watt
3-state transistor-transistor tristate logic
11
5K320 SATA OEM Specification
1.2 References
Serial ATA International Organization : Serial ATA Revision 2.6
1.3 General caution
Do not apply force to the top cover (See figure below).
Do not cover the breathing hole on the top cover (See figure below).
Do not touch the interface connector pins or the surface of the printed circuit board.
The drive can be damaged by shock or ESD (Electric Static Discharge). Any damages incurred to
the drive after removing it from the shipping package and the ESD protective bag are the
responsibility of the user
1.4 Drive handling precautions
Do not press on the drive cover during handling.
12
5K320 SATA OEM Specification
2 Outline of the drive
2.5-inch, 9.5 -mm Height
Perpendicular Recording
Formatted capacities of 320GB, 250GB, 160GB,120GB and 80GB(512 bytes/sector)
SATA Interface conforming to Serial ATA International Organization: Serial ATA Revision
2.6(15-February-2007)
Integrated controller
No-ID recording format
Coding : 100/102 2bit parity (199/200 RC Modulation Encoding)
Multi zone recording
Enhanced ECC
10 bit 40 symbol non Interleaved Read Solomon code
Non interleave On-The –Fly correction
Included 2 symbol system ECC
Segmented Buffer with write cache
8192 KB - Upper 736 KB is used for firmware
Fast data transfer rate
HTS5432xxL9A3xx model : up to 3.0Gbit/s
HTS5432xxL9SAxx model : up to 1.5Gbit/s
Media data transfer rate (max):
775 Mb/s
Average seek time: 12 ms for read
Closed-loop actuator servo (Embedded Sector Servo)
Rotary voice coil motor actuator
Load/Unload mechanism
Mechanical latch
0.55 Watts at idle state
Power on to ready
3.5 sec
Operating shock
3920 m/sec2 ( 400 G)/2ms
1960 m/sec2 (200G)/1ms
Non operating shock
9800 m/sec2 ( 10 00 G)/1ms
Bulk E ncryption optional (HTS5432xxL9SA xx model only)
13
5K320 SATA OEM Specification
Part 1 Functional Specification
14
5K320 SATA OEM Specification
3 Fixed disk subsystem description
3.1 Control Electronics
The control electronics works with the following functions:
Ÿ SATA Interface Protocol
Ÿ Embedded Sector Servo
Ÿ No-ID (TM) formatting
Ÿ Multizone recording
Ÿ Code: 100/102 bit parity (199/200 RC Modulation Encoding)
Ÿ System ECC
Ÿ Enhanced Adaptive Battery Life Extender
3.2 Head disk assembly data
The following techno logies are used in the drive:
Ÿ Femto Slider
Ÿ Perpendicular recording disk and write head
Ÿ TMR head
Ÿ Integrated lead suspension (ILS)
Ÿ Load/unload mechanism
Ÿ Mechanical latch
15
5K320 SATA OEM Specification
4 Fixed disk characteristics
4.1 Formatted capacity by model number
Description
Physical Layout
Bytes per Sector 512 512
Number of Heads 4 3
Number of Disks 2 2
Logical Layout
Number of Heads 16 16
Number of Sectors/
Track
Number of
Cylinders
Number of Sectors 625,142,448 488,397,168
Total Logical Data
Bytes
Description
Physical Layout
Bytes per Sector 512 512 512
Number of Heads 2 2 1
Number of Disks 1 1 1
Logical Layout
Number of Heads 16 16 16
Number of Sectors/
Track
Number of
Cylinders
Number of Sectors 312,581,808 234,441,648 156,301,488
Total Logical Data
Bytes
HTS543232L9A300
HTS543232L9SA00
63 63
16,383 16,383
320,072,933,376 250,059,350,016
HTS543216L9A300
HTS543216L9SA00
63 63 63
16,383 16,383 16,383
160,041,885,696 120,034,123,776 80,026,361,856
Table 1. Formatted capacity by model number.
HTS543225L9A300
HTS543225L9SA00
HTS543212L9A300
HTS543212L9SA00
HTS543280L9A300
HTS543280L9SA00
16
5K320 SATA OEM Specification
4.2 Data sheet
Rotational Speed (RPM) 5400540054005400 5400
Data transfer rates (buffer to/from
media) (Mbps)
Data transfer rates (Gbit/sec) 1.5/
Recording density (Kbit/mm) (Max)
(KBPI) (Max)
Track density ( Ktrack/mm)(Max)
(KTPI) (Ma x)
Areal density (Kbit/sq-mm.- Max)
(Gbit/sq-inch - Max)
Number of zones 24 24 24 24 24
320
GB
729 775 729 674 729
3.0
1154 1207 1154 1066 1154
216
250
250
GB
1.5/
3.0
216
261
160
GB
1.5/
3.0
216
250
120
GB
1.5/
3.0
182
194
80
GB
1.5/
3.0
216
250
Table 2. Data sheet
4.3 Cylinder allocation
Data format is allocated by each head characteristics. Typical format is described below.
Drive performance is characterized by the following parameters:
Ÿ Command Overhead
Ÿ Mechanical Positioning
w Seek Time
w Latency
Ÿ Data Transfer Speed
Ÿ Buffering Operation (Look ahead/Write Cache)
Note: All the above parameters contribute to drive performance. There are other parameters which
contribute to the performance of the actual system. This specification defines the essential characteristics
of the drive. This specification does not include the system throughput as this is dependent upon the
system and the application.
The following table gives a typical valuefor each parameter.
Function
Average Random Seek Time - Read (ms) 12
Average Random Seek Time - Write (ms) 13
Rotational Speed (RPM) 5400
Power-on-to-ready (sec) 3.5
Command overhead (ms) 1.0
Disk-buffer data transfer (Mb/s) (max) 775
Buffer-host data transfer ( Gbit/s) (max) 1.5 / 3.0
Table 4. Performance characteristics
4.4.1 Command overhead
Command overhead time is defined as the interval from the time that a drive receives a command to the
time that the actuator starts its motion.
18
5K320 SATA OEM Specification
4.4.2 Mechanical positioning
4.4.2.1 Average seek time (including settling)
Command Type Typical (ms) Max. (ms)
Read 12 14
Write 13 15
Table 5. Mechanical positioning performance
Typical and Max. are defined throughout the performance specification as follows:
Typical Average of the drive population tested at nominal environmental and voltage conditions.
Max. Maximum value measured on any one drive over the full range of the environmental and
voltage conditions. (See section 6.1, "Environment" and section 6.2, "DC power
requirements" )
The seek time is measured from the start of motion of the actuator to the start of a reliable read or write
operation. A reliable read or write operation implies that error correction/recovery is not employed to
correct arrival problems. The Average Seek Time is measured as the weighted average of all possible
seek combinations.
= inward measured seek time for an n-track seek
= outward measured seek time for an n-track seek
out
)
4.4.2.2 Full stroke seek
Command Type Typical (ms) Max. (ms)
Read 20.0 25.0
Write 21.0 26.0
Table 6. Full stroke seek time
Full stroke seek time in milliseconds is the average time of 1000 full stroke seeks.
4.4.2.3 Single track seek time (without command overhead, including
settling)
CommandTypeTypical (ms)Maximum (ms)
Read 1.0 2.0
Write 1.1 2.2
Table 7. Single track seek time
Single track seek is measured as the average of one (1) single track seek from every track in both
directions (inward and outward).
4.4.2.4 Average latency
Rotational Speed
(RPM)
5400 11.1 5.5
Table 8. Latency time
Time for one revolution
(ms)
Average Latency
(ms)
19
5K320 SATA OEM Specification
4.4.2.5 Drive ready time
Condition Typical (sec) Max. (sec)
Power On To Ready 3.5 9.5
Table 9. Drive ready time
ReadyThe condition in which the drive is able to perform a media access command
(for example —read, write) immediately.
Power On To Ready This includes the time required for the internal self diagnostics.
20
5K320 SATA OEM Specification
4.4.3Operating modes
Operating mode Description
Spin-Up
Seek
Write
Read
Performance idle
Active idle
Low power idle
Standby
Sleep
Start up time period from spindle stop or power down.
Seek operation mode
Write operation mode
Read operation mode
The device is capable of responding immediately to media access requests. All
electronic components remain powered and the full frequency servo remains
operational.
The device is capable of responding immediately to media access requests. Some
circuitry—including servo system and R/W electronics—is in power saving mode.
The head is parked near the mid-diameter the disk without servoing.
A device in Active idle mode may take longer to complete the execution of a
command because it must activate that circuitry.
The head is unloaded onto the ramp position. The spindle motor is rotating at full
speed.
The device interface is capable of accepting commands. The spindle motor is
stopped. All circuitry but the host interface is in power saving mode.
The execution of commands is delayed until the spindle becomes ready.
The device requires a soft reset or a hard reset to be activated. All electronics,
including spindle motor and host interface, are shut off.
Table 10. Operating mode
4.4.3.1 Mode transition time
From To Transition
Time (typ)
Standby Idle 2.5 9.5
Table 11. Drive ready time
Transition Time
(max.)
4.4.3.2 Operating mode at power on
The device goes into Idle mode after power on or hard reset as an initial state. .
4.4.3.3 Adaptive power save control
The transient timing from Performance Idle mode to Active Idle mode and Active Idle mode to Low Power
Idle mode is controlled adaptively according to the access pattern of the host system. The transient
timing from Low Power Idle mode to Standby mode is also controlled adaptively, if it is allowed by Set
Features Enable Advanced Power Management subcommand.
21
5K320 SATA OEM Specification
5 Data integrity
5.1 Data loss on power off
Ÿ Data loss will not be caused by a power off during any operation except the write operation.
Ÿ A power off during a write operation causes the loss of any received or resident data that has not
been written onto the disk media.
Ÿ A power off during a write operation might make a maximum of one sector of data unreadable. This
state can be recovered by a rewrite operation.
5.2 Write Cache
When the write cache is enabled, the write command may complete before the actual disk write operation
finishes. This means that a power off, even after the write command completion, could cause the loss of
data that the drive has received but not yet written onto the disk.
In order to prevent this data loss, confirm the completion of the actual write operation prior to the power
off by issuing a
The equipment status is available to the host system any time the drive is not ready to read, write, or seek.
This status normally exists at the power-on time and will be maintained until the following conditions are
satisfied:
Ÿ The access recalibration/tuning is complete.
Ÿ The spindle speed meets the requirements for reliable operation.
Ÿ The self-check of the drive is complete.
The appropriate error status is made available to the host system if any of the following conditions occur
after the drive has become ready:
Ÿ The spindle speed lies outside the requirements for reliable operation.
Ÿ The occurrence of a Write Fault condition .
5.4 WRITE safety
The drive ensures that the data is written into the disk media properly. The following conditions are
monitored during a write operation. When one of these conditions exceeds the criteria, the write operation
is terminated and the automatic retry sequence is invoked.
Ÿ Head off track
Ÿ External shock
Ÿ Low supply voltage
Ÿ Spindle speed out of tolerance
Ÿ Head open/short
22
5K320 SATA OEM Specification
5.5 Data buffer test
The data buffer is tested at power on reset and when a drive self -test is requested by the host. The test
consists of a write/read '00'x and 'ff'x pattern on all buffers.
5.6 Error recovery
Errors occurring on the drive are handled by the error recovery procedure.
Errors that are uncorrectable after application of the error recovery procedure are reported to the host
system as nonrecoverable errors.
5.7 Automatic reallocation
The sectors that show some errors may be reallocated automatically when specific conditions are met.
The drive does not report any auto reallocation to the host system. The conditions for auto reallocation
are described below.
5.7.1 Nonrecovered write errors
When a write operation cannot be completed after the Error Recovery Procedure (ERP) is fully carried out,
the sectors are reallocated to the spare location. An error is reported to the host system only when the
write cache is disabled and the auto reallocation has failed.
5.7.2 Nonrecoverable read error
When a read operation fails after ERP is fully carried out, a hard error is reported to the host system. This
location is registered internally as a candidate for the reallocation. When a registered location is specified
as a target of a write operation, a sequence of media verification is performed automatically. When the
result of this verification meets the required criteria, this sector is reallocated.
5.7.3 Recovered read errors
When a read operation for a sector fails and is recovered at the specific ERP step, the sector is
reallocated automatically. A media verification sequence may be run prior to the reallocation according to
the predefined conditions.
23
5K320 SATA OEM Specification
5.8 ECC
The 10 bit symbol non interleaved ECC processor provides user data verification and correction
capability. The first 6 symbol of ECC are 4 check symbols for user data and the 2 symbol system ECC.
The other 34 symbols are Read Solomon ECC. Hardware logic corrects up to 16 symbols(20 bytes)
errors on-the-fly.
2 symbol System ECC is generated when HDC receives user data from HOST, and can correct up to 1
symbol(10bit) errors on-the-fly when one transfers to HOST.
24
5K320 SATA OEM Specification
WetBulb 40'C
6 Specification
6.1 Environment
6.1.1 Temperature and humidity
Operating conditions
Temperature
Relative humidity
Maximum wet bulb temperature
Maximum temperature gradient
Altitude
Nonoperating conditions
Temperature
Relative humidity
Maximum wet bulb temperature
Maximum temperature gradient
Altitude
Table 12. Environmental condition
The system is responsible for providing sufficient air movement to maintain surface temperatures below
60°C at the center of top cover and below 63°C at the center of the drive circuit board assembly.
The maximum storage period in the shipping package is one year.
5 to 55°C (See note below)
8 to 90% noncondensing
29.4°C noncondensing
20°C/hour
–300 to 3048 m (10,000 ft)
–40 to 65°C
5 to 95% noncondensing
40°C noncondensing
20°C/hour
–300 to 12,192 m (40,000 ft)
Specification (Environment)
100
90
80
70
60
Non Operating
50
40
Relative Humidity (%)
30
20
10
0
-45-35-25 -15-55152535455565
Temperature (degC)
Figure 1 . Limits of temperature and humidity
6.1.2 Corrosion test
41'C/95%
31'C/90%
WetBulb29.4'C
Operating
65'C/23%
55'C/15%
The hard disk drive must be functional and show no signs of corrosion after being exposed to a
temperature humidity stress of 50°C/90%RH (relative humidity) for one week followed by a temperature
and humidity drop to 25'C/40%RH in 2 hours.
25
5K320 SATA OEM Specification
6.1.3 Radiation noise
The disk drive shall work without degradation of the soft error rate under the following magnetic flux
density limits at the enclosure surface.
Frequency (KHz) Limits (uT RMS)
DC 1500 0-p
0 < Frequency =< 60 500 RMS
60 < Frequency =<100 250 RMS
100 < Frequency =< 200 100 RMS
200 < Frequency =< 400 50 RMS
Table 13. Magnetic flux density limits
6.1.4 Conductive noise
The disk drive shall work without soft error degradation in the frequency range from DC to 20 Mhz
injected through any two of the mounting screw holes of the drive when an AC current of up to 45 mA
(p-p) is applied through a 50-ohm resistor connected to any two mounting screw ho les.
26
5K320 SATA OEM Specification
6.2 DC power requirements
Connection to the product should be made in a safety extra low voltage (SELV) circuits. The voltage
specifications are applied at the power connector of the drive.
ItemRequirements
Nominal supply +5 Volt dc
Supply voltage –0.3 Volt to 6.0 Volt
Power supply ripple (0–20
MHz)1
Tolerance 2
Supply rise time 1–100 ms
Watts (RMS Typical) 7
Performance Idle average 3
Active Idle average 0.8
Low Power Idle average 0.55
Read average 4
Write average 1.8
Seek average 5
Standby 0.2
Sleep 0.1
Startup (maximum peak)6
Average from power on to
ready
Table 14. DC Power requirements
100 mV p-p max.
±5%
1.7
1.8
2.2
5.0
3.8
Footnotes:
1. The maximum fixed disk ripple is measured at the 5 volt input of the drive.
2. The disk drive shall not incur damage for an over voltage condition of +25% (maximum
3. The idle current is specified at an inner track.
4. The read/write current is specified based on three operations of 63 sector read/write per
5. The seek average current is specified based on three operations per 100 ms.
6. The worst case operating current includes motor surge.
7. “Typical” mean average of the drive population tested at nominal environmental and
duration of 20 ms) on the 5 volt nominal supply.
100 ms.
voltage conditions.
27
5K320 SATA OEM Specification
6.2.1Power consumption efficiency
Capacity 320GB 250GB 160GB 120GB 80GB
Power Consumption Efficiency
(Watts/GB)
0.0017 0.0022 0.0034 0.0046 0.0069
Table 15. Power consumption efficiency
Note: Power consumption efficiency is calculated as Power Consumption of Low Power Idle Watt/
Capacity (GB).
28
5K320 SATA OEM Specification
6.3 Reliability
6.3.1 Data reliability
Ÿ Probability of not recovering data is 1 in 10
Ÿ ECC implementation
On-the-fly correction performed as a part of read channel function reco vers up to 16 symbols of error in 1
sector (1 symbol is 10 bits).
14
bits read
6.3.2 Failure prediction (S.M.A.R.T.)
The drive supports Self -monitoring, analysis and reporting technology (S.M.A.R.T.) function. The details
are described in section 11.8, " S.M.A.R.T. Function" and in Section 13.32, "S.M.A.R.T. Function Set
(B0h)"
6.3.3 Cable noise interference
To avoid any degradation of performance throughput or error when the interface cable is routed on top or
comes in contact with the HDA assembly, the drive must be grounded electrically to the system frame by
four screws. The common mode noise or voltage level difference between the system frame and power
cable ground or AT interface cable ground should be in the allowable level specified in the power
requirement section.
6.3.4 Service life and usage condition
The drive is designed to be used under the following conditions:
Ÿ The drive should be operated within specifications of shock, vibration, temperature, humidity, altitude,
and magnetic field.
Ÿ The drive should be protected from ESD.
Ÿ The breathing hole in the top cover of the drive should not be covered.
Ÿ Force should not be applied to the cover of the drive.
Ÿ The specified power requirements of the drive should be satisfied.
Ÿ The drive frame should be grounded electrically to the system through four screws.
Ÿ The drive should be mounted with the recommended screw depth and torque.
Ÿ The interface physical and electrical requirements of the drive should satisfy Serial ATA Revision 2.6.
Ÿ The power-off sequence of the drive should comply with the 6.3 .6.2,"Required power-off
sequence.”
Service life of the drive is approximately 5 years or 20,000 power on hours, whichever comes first, under
the following assumptions:
Ÿ Less than 333 power on hours per month.
Ÿ Seeking/Writing/Reading operation is less than 20% of power on hours.
This does not represent any warranty or warranty period. Applicable warranty and warranty period are
covered by the purchase agreement.
29
5K320 SATA OEM Specification
6.3.5 Preventive maintenance
None.
6.3.6 Load/unload
The product supports a minimum of 600,000 normal load/unloads.
Load/unload is a functional mechanism of the hard disk drive. It is controlled by the drive micro code.
Specifically, unloading of the heads is invoked by the following commands:
Ÿ Standby
Ÿ Standby immediate
Ÿ Sleep
Load/unload is also invoked as one of the idle modes of the drive.
The specified start/stop life of the product assumes that load/unload is operated normally, not in
emergency mode.
6.3.6.1 Emergency unload
When hard disk drive power is interrupted while the heads are still loaded the micro code cannot operate
and the normal 5 -volt power is unavailable to unload the heads. In this case, normal unload is not
possible. The heads are unloaded by routing the back EMF of the spinning motor to the voice coil. The
actuator vel ocity is greater than the normal case and the unload process is inherently less controllable
without a normal seek current profile.
Emergency unload is intended to be invoked in rare situations. Because this operation is inherently
uncontrolled, it is more mechanically stressful than a normal unload.
The drive supports a minimum of 20,000 emergency unloads.
6.3.6.2 Required Power-Off Sequence
The required host system sequence for removing power from the drive is as follows:
Ÿ Step 1: Issue one of the following commands.
Ÿ Standby
Ÿ Standby immediate
Ÿ Sleep
Note: Do not use the Flush Cache command for the power off sequence because this command
does not invoke Unload.
Ÿ Step 2: Wait until the Command Complete status is returned.
In a typical case 500 ms are required for the command to finish completion; however, the host system
time out value needs to be 30 seconds considering error recovery time.
Ÿ Step 3: Terminate power to HDD.
This power-down sequence should be followed for entry into any system power-down state, system
suspend state, or system hibernation state. In a robustly designed system, emergency unload is limited
to rare scenarios, such as battery removal during operation.
6.3.6.3 Power switch design considerations
In systems that use the Travelstar 5K320 consideration should be given to the design of the system
power switch.
Hitachi recommends that the switch operate under control of the host system, as opposed to being
hardwired. The same recommendation is made for cover-close switches. When a hardwired switch is
30
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1 point = 1 manual.
You can buy points or you can get point for every manual you upload.