Seagate ST9655 Series User manual

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . .
ST9655 Family
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . .
ST9655AG, ST9550AG
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . .
ST9385AG
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . .
ATA Interface Drives
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . .
Product Manual
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . .
ST9655 Family
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . .
ST9655AG, ST9550AG
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . .
ST9385AG
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . .
ATA Interface Drives
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . .
Product Manual
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . .

1994 Seagate Technology,Inc. All rights reserved
Publication Number: 36270-001, Rev. A
September 1994
Seagate®, Seagate Technology®and the Seagate logo are registered
trademarks of Seagate Technology, Inc. Other product names are reg-
istered trademarks or 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 Technology, Inc.

Contents
1.0 Drive specifications . . . . . . . . . . . . . . . . . . . . . . 1
1.1 Formatted capacity . . . . . . . . . . . . . . . . . . . . . 1
1.2 Physical organization . . . . . . . . . . . . . . . . . . . . 1
1.3 Logical organization . . . . . . . . . . . . . . . . . . . . . 1
1.4 Default logical geometry . . . . . . . . . . . . . . . . . . . 1
1.5 Recording and interface technology . . . . . . . . . . . . . 2
1.6 Physical dimensions . . . . . . . . . . . . . . . . . . . . . 2
1.7 Seek time . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.8 Start times . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.9 Reliability . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.10 Drive acoustics . . . . . . . . . . . . . . . . . . . . . . . 4
1.11 Environment . . . . . . . . . . . . . . . . . . . . . . . . 4
1.11.1 Ambient temperature . . . . . . . . . . . . . . . . . 4
1.11.2 Temperature gradient . . . . . . . . . . . . . . . . . 4
1.11.3 Relative humidity . . . . . . . . . . . . . . . . . . . 4
1.11.4 Altitude . . . . . . . . . . . . . . . . . . . . . . . . 4
1.11.5 Shock . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.11.6 Vibration . . . . . . . . . . . . . . . . . . . . . . . . 5
1.12 Power specifications . . . . . . . . . . . . . . . . . . . . 6
1.12.1 Power management . . . . . . . . . . . . . . . . . . 6
1.12.2 Power consumption . . . . . . . . . . . . . . . . . . 8
1.12.3 Conducted noise . . . . . . . . . . . . . . . . . . . 10
1.12.4 Voltage tolerance . . . . . . . . . . . . . . . . . . . 10
1.13 Agency certification . . . . . . . . . . . . . . . . . . . . 10
1.13.1 UL/CSA listing . . . . . . . . . . . . . . . . . . . . . 10
1.13.2 FCC verification . . . . . . . . . . . . . . . . . . . . 10
1.14 Compatibility notes . . . . . . . . . . . . . . . . . . . . . 11
1.14.1 ECC testing . . . . . . . . . . . . . . . . . . . . . . 11
ST9655 Family Product Manual, Rev. A iii

2.0 Drive mounting and configuration . . . . . . . . . . . . . . 13
2.1 Handling and static-discharge precautions . . . . . . . . . 13
2.2 Mounting the ST9655 family drives . . . . . . . . . . . . . 13
2.3 Master/slave configuration . . . . . . . . . . . . . . . . . . 15
2.4 Configuring a remote LED . . . . . . . . . . . . . . . . . . 15
3.0 ATA interface . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.1 ATA interface connector . . . . . . . . . . . . . . . . . . . 17
3.2 ATA interface signals and connector pins . . . . . . . . . . 18
3.2.1 AT bus signal levels . . . . . . . . . . . . . . . . . . 19
3.3 ATA interface commands . . . . . . . . . . . . . . . . . . 20
3.3.1 Identify Drive command . . . . . . . . . . . . . . . . 22
3.3.2 Set Features command . . . . . . . . . . . . . . . . . 26
3.3.3 Rest/Resume commands . . . . . . . . . . . . . . . . 27
iv ST9655 Family Product Manual, Rev. A

Figures
Figure 1. Typical startup and operation current profile for the
ST9655AG . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 2. Typical startup and operation current profile for the
ST9550AG and ST9385AG . . . . . . . . . . . . . . . . 9
Figure 3. Mounting dimensions for the ST9655 family drives . . . . 14
Figure 4. Master/slave jumpers for the ST9655 family drives . . . . 16
Figure 5. ATA interface connector for the ST9655 family drives . . 17
ST9655 Family Product Manual, Rev. A v

1.0 Drive specifications
1.1 Formatted capacity
ST9655AG ST9550AG ST9385AG
Guaranteed Mbytes
(1 Mbyte = 106bytes) 524 455 341
Guaranteed sectors 1,024,128 889,248 666,876
Bytes per sector 512 512 512
1.2 Physical organization
ST9655AG ST9550AG ST9385AG
Read/Write heads 8 8 6
Discs 4 4 3
1.3 Logical organization
The ST9655 family drives support all head, cylinder andsector geome-
tries, subject to the maximums specified below, and to the following
condition:
(
sectors ) ×( heads ) × (cylinder s) ≤ total sectors per drive
ST9655AG ST9550AG ST9385AG
Sectors per track (max) 64 64 64
Read/Write heads (max) 16 16 16
Cylinders (max) 1,024 1,024 1,024
1.4 Default logical geometry
ST9655AG ST9550AG ST9385AG
Sectors per track 63 59 51
Read/Write heads 16 16 14
Cylinders 1,016 942 934
ST9655 Family Product Manual, Rev. A 1

1.5 Recording and interface technology
Specification ST9655AG ST9550AG ST9385AG
Interface ATA ATA ATA
Recording method RLL (1,7) RLL (1,7) RLL (1,7)
Recording density (BPI) 72,100 59,124 59,124
Flux density (FCI) 44,360 44,360 44,360
Track density (TPI) 3,227 3,282 3,282
Spindle speed (RPM ±0.5%) 3,980 3,980 3,980
Internal data transfer rate
(Mbits per sec max—ZBR) 28.26 27.28 27.28
I/O data transfer rate (Mbytes per sec max)
PIO Mode 3 with IORDY
Multiword DMA Mode 1 11.1 13.3 8.0 13.3 8.0 13.3
Interleave 1:1 1:1 1:1
Cache buffer (Kbytes) 120 120 120
1.6 Physical dimensions
Height (max) inches
(mm) 0.754 (19.15)
Width (max) inches
(mm) 2.760 (70.10)
Depth (max) inches*
(mm) 4.010 (101.85)
Weight (typical) ounces
(kg) 7.4 (0.21)
* Excludes I/O connector pins, whichmay extendup to 0.010 inches be-
yond the edge of the head/disc assembly.
1.7 Seek time
Allseektimesaremeasuredusinga25 MHz486 ATcomputer(orfaster)
witha8.3MHzI/Obus. Themeasurementsaretakenwithnominalpower
at sea level and 25°C ambient temperature. The specifications in the
following table are defined asfollows:
2 ST9655 Family Product Manual, Rev. A

•Track-to-track seek time is an average of all possible single-track
seeks in both directions.
•Averageseektimeisatruestatisticalrandomaverageofatleast5,000
measurements of seeks between random tracks, less overhead.
•Full-stroke seektime isone-halfthe timeneeded to seek from the first
data cylinder to the maximum data cylinder and back to the first data
cylinder. The full-stroke average is determined by measuring 100
full-stroke seeks in both directions.
Seek type Typical read (msec) Typical write (msec)
Track-to-track 6 7
Average 16 20
Full-stroke 26 28
Average latency (msec): 7.54 msec
1.8 Start times
Power-on to Ready (sec) 7 typical
(responds to selectionand status
commands within 2 seconds of power-
up)
Standby to Ready(sec) 3 typical
1.9 Reliability
Nonrecoverable read errors 1 per 1013 bits read
(with retries enabled)
Mean time between failures 300,000power-on hours
(nominal power, at sea level,
25°C ambient temperature)
Contact start-stop cycles 50,000 cycles
(60 contact starts per hour max., with a
50% power-on duty cycle and nominal
power, at sea level, at ambient
temperature and relative humidity)
Preventive maintenance None required
Mean time to repair 10 minutes
ST9655 Family Product Manual, Rev. A 3

Service life 5 years
1.10 Drive acoustics
Driveacousticsaremeasuredas soundpressure 1meterfromthe drive.
Mode Maximum
Idle (dBA) 30
Seek (dBA) 33
1.11 Environment
1.11.1 Ambient temperature
Operating 5° to 55°C (41° to 131°F)
Nonoperating –40° to 70°C (–40° to 158°F)
1.11.2 Temperature gradient
Operating 30°C/hr (54°F/hr) max, without condensation
Nonoperating 30°C/hr (54°F/hr) max, without condensation
1.11.3 Relative humidity
Operating 8% to 80% noncondensing (10% per hour max)
Max. wet bulb temperature: 29.4°C (85°F)
Nonoperating 8% to 90%noncondensing (10% per hour max)
Max. wet bulb temperature: 40°C (104°F)
1.11.4 Altitude
Operating –1,000 ft to 10,000 ft (–300 m to 3,000 m)
Nonoperating –1,000 ft to 40,000 ft (–300 m to 12,190 m)
4 ST9655 Family Product Manual, Rev. A

1.11.5 Shock
Allshockspecificationsassumethatthedriveis mountedinanapproved
orientation with the input levels at the drive mounting screws. The
nonoperating specifications assume that the read/write heads are posi-
tioned in the shipping zone.
Note. At power-down, the read/write heads automatically move to the
shipping zone. The head and slider assembly park inside of the
maximum data cylinder. When power is applied, the heads re-
calibrate to Track 0.
1.11.5.1 Operating shock
The ST9655 family drives, which incorporate SafeRitecomponents,
can withstand a maximum operating shock of 100 Gs without nonre-
coverable data errors (based on half-sine shock pulses of 2 and 11
msec).
1.11.5.2 Nonoperating shock
The maximum nonoperating shock that the ST9655 family drives can
experiencewithoutincurringphysicaldamageordegradationinperform-
ancewhensubsequentlyputintooperationis150Gs (basedonhalf-sine
shock pulses of 2 and 11 msec).
1.11.6 Vibration
All vibration specifications assume that the drive is mounted in an
approved orientation with the input levels at the drive mounting screws.
The nonoperating specifications assume that the read/write heads are
positioned in the shipping zone.
1.11.6.1 Operating vibration
The following table lists the maximum vibration levels that a ST9655
family drive may experience without incurring physical damage or deg-
radation in performance.
5–22 Hz 0.020-inch displacement (double amplitude)
22–450 Hz 0.5 Gs acceleration (peak)
450–22 Hz 0.5 Gs acceleration (peak)
22–5 Hz 0.020-inch displacement (double amplitude)
ST9655 Family Product Manual, Rev. A 5

1.11.6.2 Nonoperating vibration
The following table lists the maximum nonoperating vibration that a
ST9655 family drive can experience without incurring physical damage
or degradation in performance when the drive is operated.
5–22 Hz 0.162-inch displacement (double amplitude)
22–450 Hz 4 Gs acceleration (peak)
450–22 Hz 4 Gs acceleration (peak)
22–5 Hz 0.162-inch displacement (double amplitude)
1.12 Power specifications
ST9655family drives receive DC power(+5V) throughpin 41 and pin 42
of the ATA interface connector.
1.12.1 Power management
Power management is required for low-power and portable computer
systems. In most systems, you can control power management through
the system setup program. The ST9655 family drives feature several
power-management modes, which are described briefly below:
Active mode. ThedriveisinActivemodeduringtheread/writeandseek
operations.
Idle mode. At power-on, the drive sets the idle timer to enter Idle mode
after 5 seconds of inactivity. You can set the idle timer delay using the
system setup utility. In Idle mode, the spindle remains up to speed. The
heads are parked away from the data zones for maximum data safety.
The buffer remains enabled, and the drive accepts all commands and
returnsto Active mode any time discaccess is necessary.
Standby mode. The drive enters Standby mode when the host sends a
StandbyImmediatecommand.Ifthestandbytimerhasbeensetbythehost
system,thedrivecanalsoenterStandbymodeautomaticallyafterthedrive
has been inactive for a specifiable length of time. The standby timer delay
is system-dependent and is usually established using the system setup
utility. In Standby mode, thebuffer remains enabled, the headsare parked
and the spindle is at rest. The drive accepts all commands and returns to
Active mode any time discaccess is necessary.
Sleep mode. The drive enters Sleep mode after it receives a Sleep
Immediate command from the host. The heads are parked and the
spindle is at rest. The drive leaves Sleep mode after it receives a Hard
6 ST9655 Family Product Manual, Rev. A

Resetor SoftResetcommandfromthehost.AfterreceivingaSoftReset
command, the drive exits Sleep mode and enters Standby mode with all
current emulation and translation parameters intact.
Rest/resume commands. Some host systems reduce drive power
consumption by removing all power from the drive. Before shutting off
power, the host must save drive state information (including current
logical geometry, set feature parameters, cache status and task file
registers). After restoring power to the drive, the host restores the drive
to its prerest condition. This process is implemented using three com-
mands: Rest, Read Drive State and Restore Drive State. The Rest
command prepares the drive for a subsequent Read Drive State com-
mand. The Read Drive State command captures the state of the I/O
registers. The Restore Drive State command readsthe drive state data
from memory and restores the drive state based on this data. These
commands are described in greater detail in section 3.3.3 on page 27.
Idle and standby timers. The drive sets the default time delay for the idle
timeratpower-on.Inmostsystems,youcansetthisdelayusingthesystem
setup utility. Each timethe drive performsanActive function (read,write or
seek),theidleandstandbytimersarereinitializedandbegincountingdown
from theirspecifieddelay timestozero.If theidle timer reacheszerobefore
anydriveactivity isrequired,thedrivemakesatransitiontoIdlemode.Ifthe
hosthassetthestandbytimer,thestandbycountdowncontinues.Ifthehost
hasnotset the standby timer, the driveremains in Idle mode. If thestandby
timer reaches zero before any drive activity is required, the drive makes a
transition to Standby mode. In both Idle and Standby mode, the drive
accepts all commands and returns to Active mode when disc access is
necessary.
Deferred spinup. ST9655 family drives may be factory-configured for
deferred spinup. If configured for deferred spinup, the drive does not spin
up immediately after power-on, but waits until it receives a command from
the host. At power-on, the drive posts a status of 80Hand all master/slave
protocols are completed before the drive reports a status of 50H. After the
drive receives a command from the host, it executes the spinup/upload
process. If the host issues a soft reset before the drive spins up, the drive
responds normally, except that it does not spin up until it receives a
command from the host.
ST9655 Family Product Manual, Rev. A 7

1.12.2 Power consumption
Power requirements for the ST9655 familydrives are listed in the tables
below. Typical power measurements are based on an average of drives
tested under nominal conditions, using 5.0V input voltage at 25°C
ambient temperature at sea level. Active mode current and power are
measured with two spindle rotations between each operation and the
drive in default logical geometry. Startup power is measured from the
time the drive is powered on to the time the drive is ready for normal
operation. Seeking power and currents are measured during one-third-
strokebufferedseeks. Read/Write powerandcurrent are measuredwith
the heads on track.
ST9655AG power consumption
Mode Typical watts RMS (at nominal voltage) Typical amps RMS (at nominal voltage)
Spinup 3.79 0.758
Active
Seeking
Read/Write 1.78 1.92 0.356 0.384
Idle 1.03 0.206
Standby 0.30 0.060
Sleep 0.23 0.046
ST9550AG and ST9385AG power consumption
Mode Typical watts RMS (at nominal voltage) Typical amps RMS (at nominal voltage)
Spinup 3.90 0.780
Active
Seeking
Read/Write 1.50 1.50 0.300 0.300
Idle 0.90 0.180
Standby 0.33 0.065
Sleep 0.28 0.055
8 ST9655 Family Product Manual, Rev. A

1.12.2.1 Typical current profiles
Typical startup and operation current profiles for the ST9655 family drives
are shown in Figures 1 and 2.
0
200
400
600
800
1000
1200
0 1 2 3 4 5 6 7 8 9 10 11
Spi
nup
Upload c
ode
Drive r
eady
Idl
e
St
andby
mo
de
mo
de
Current (mA
)
Sleep
mo
de
Activ
e
mo
de
Time (seconds
)
Figure 1. Typical startup and operation current profile for the ST9655AG
0
100
200
300
400
500
600
700
800
900
1000
0 1 2 3 4 5 6 7 8 9 10
Spinu
p
Upload cod
e
Drive r
eady
Idl
e
St
andby
mode
mode
Current (mA
)
Sl
eep
mode
Activ
e
mode
Time (seconds
)
Figure 2. Typical startup and operation current profile for the ST9550AG
and ST9385AG
ST9655 Family Product Manual, Rev. A 9

1.12.3 Conducted noise
The drive is expected to operate with a maximumof:
•150 mV peak-to-peak triangular-wave injected noise at the power
connector.Thefrequency is10Hzto100KHzwithequivalentresistive
loads.*
•100 mV peak-to-peak triangular-wave injected noise at the power
connector. The frequency is 100 KHz to 10 MHz with equivalent
resistive loads.*
* Equivalent resistance is calculated by dividing the respective voltage
by the typical RMS read/write current.
1.12.4 Voltage tolerance
Voltage tolerance (including noise): +5 volts + 5%, – 10%
1.13 Agency certification
1.13.1 UL/CSA listing
TheST9655familydrivesarelistedinaccordancewithUL1950andCSA
C22.2 (950-M89) and meet all applicable sections of IEC 380, IEC 435,
IEC 950, VDE 0806/08.81 and EN 60950 as tested by TUV-Rheinland,
North America.
1.13.2 FCC verification
The ST9655 family drives are intended to be contained solely within a
personal computer or similar enclosure (not attached to an external
device). As such, each drive is considered to be a subassembly even
when it is individually marketed to the customer. As a subassembly, no
Federal Communications Commission verification or certification of the
device is required.
Seagate Technology, Inc. has tested this device in enclosures as de-
scribed above to ensure that the total assembly (enclosure, disc drive,
motherboard,power supply,etc.) does comply with the limits for a Class
B computing device, pursuant to Subpart J, Part 15 of the FCC rules.
Operation with noncertified assemblies is likely to result in interference
to radio and television reception.
Radioandtelevisioninterference.Thisequipmentgeneratesanduses
radio frequencyenergy and if not installed and used in strict accordance
withthemanufacturer’sinstructions,maycauseinterferencetoradioand
television reception.
10 ST9655 Family Product Manual, Rev. A

This equipment is designed to provide reasonable protection against
such interference in a residential installation. However, there is no
guarantee thatinterferencewillnotoccurinaparticularinstallation.Ifthis
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 deviceto one side or the other of the radio or TV.
•Move the devicefarther away from the radio or TV.
•Plug the computer into a different outlet so that the receiver and
computer are on different branch outlets.
Ifnecessaryyoushouldconsultyourdealeroranexperiencedradio/tele-
vision technician for additional suggestions. You may find helpful the
followingbookletpreparedbytheFederalCommunicationsCommission:
How to Identify and Resolve Radio-Television Interference Problems .
This booklet is available from the Superintendent of Documents,
U.S. Government Printing Office, Washington, DC 20402. Refer to pub-
lication number 004-000-00345-4.
1.14 Compatibility notes
1.14.1 ECC testing
When an ST9655 family drive performs hardware-based ECC error
correction on-the-fly, the drive doesnot reportan ECC error. This allows
ECC correction without degrading drive performance. Some older drive
diagnosticprograms test ECC featuresby creatingsmall data errors and
then checking to see if they are reported. Such tests, when run on an
ST9655 family drive, may incorrectly report an ECC detection failure
becausethedrivehardwarecorrectsthedataautomatically,avoidingthe
error rather than reporting it. Such a report does not indicate a drive
malfunction.
ST9655 Family Product Manual, Rev. A 11