Seagate ST41800K User manual

c5S}> Seagate
Elite Disc Drive
ST41BOOK
User's Manual
(/Pf Interface)

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Section 1. General description
The Seagate Elite disc drives are high speed, random access digital data
storage devices that connect to a central processor through a controller. The
drive is shown in Figure 1, and its specifications are listed in Table 1 on the
following page.
Thedrive isa component for installation in an enclosuredesigned forthe drive.
The enclosure design must ensure adequate cooling for the drive, and it must
address the requirements for grounding and for shielding of emissions. The
reference manual (publication 83327430) presents guidelines fordesigning the
enclosure, but the design is your responsibility.
Control
Board
spindve sync \~
R Connector
~\
emote i
Connector
;;:~
...-:
Figure 1. The ST41800K disc drive

General description
Table 1. Drive specifications
Characteristics
Size
Interface
Capacity-bytes
(unformatted)
Physical
Recording
Tiansfer rate
Conditions
Dimensions
Weight
(drive only)
IPl-2
Per drive
Per physical track
Per logical track
Per cylinder
Number of discs
Read/write heads
Servo heads
Physical heads
per surface
Cylinders per
head/disc assy
Modulation
Disc speed
at 5400 RPM
Specifications
See "Space requirements"
in section 2
4.1 kg (9.0 !b)
1,985,968, 714
42,000
84,000
756,000
11
18 (9 logical heads)
2627* (0-2626 logical)
2,7 code
60.48 rv1Hz (7.56 ~1by1es/sec)
* Users normally reserve two cylinders for diagnostic use (cylinder 2626 for defect
map and cylinder 2625 for diagnostics).
2
continued

General description
continued from previous page
Characteristics Conditions Specifications
Seek time
(time required to move heads
to a different track address) Typical full 22.5 msec max
Typical average 11.5 msec max
Typical one-track 1.7 msec max
Latency
(time required to reach a
particular track address after
head positioning is complete) Average 5.55 msec
(disc rotation
at 5400 RPM)
Maximum 11.17 msec
(disc rotation
at 5373 RPM)
Start time** 30 sec max
Stop time 30 sec max
** Following the power sequence delay, once DC power is applied and start
conditions are present.
3
Thedrive contains all the circuits and mechanical devices necessary to record
data on and recover it from itsdiscs. The drive requires DC voltage inputs from
an external powersupply, which receives its AC input powerfrom the site main
powersource. Apowersupplyand DC powercable areavailable as accessories
if required for system installation.
Thedriveconsists of aheadanddiscassembly(HOA) and severalcircuit boards
mounted on a common chassis. The circuit boards contain the electronics
required fordriveoperation. TheHDA isa sealed unit containing the electrome-
chanical components used for data storage and retrieval. These components
include the discs, spindle, drive motor, actuator, and heads.
The eleven discs provide the recording medium for the drive. These discs are
mountedona spindle, andthespindle is coupled directlyto the drivemotor. The
drive motorrotates the discsat 5400 RPM and also produces a circulation of air
within the sealed HOA.
All functions performed by the drive are done under direction of the controller.

General description 4
Asshown in Figure 2, the controllercommunicates with thedrivevia the interface
which consists of a number of 1/0 lines carrying the necessary signals to and
from the drive. Refer to the reference manual for a description of interface
functions.
Some interface lines, including those that carry commands to the drive, are not
enabled unless the drive is selected by the controller. Unit selection allows the
controller, which can be connected to more than one drive, to initiate and direct
an operation on a specific drive.
m ~~
II
' I
e
r
0 f
I a
I c
LU
e
Data recorded in
concentric tracks
Unit
Selection
Logic
Read/Write
I nnif"'
--~·-
Seek
Logic
Track
Orientation
Logic
Error
Detection
Logic
Head
Selection
Logic
~
Positioning ~
D•vk• rr
<c: ========~> Discs
Power Supply
Figure 2. Drive functional block diagram

General description 5
All operations performed by the drive are related to data recovery and storage
(normally referred to as reading and writing). The actual reading and writing is
performed by heads that are positioned over the recording surfaces of the
rotating discs. There is one head for each data surface. The heads are
positioned in such awaythatdata iswritten in concentrictracks aroundthe disc
surfaces (see Figure 2).
Before any read or write operation can be performed, the controller must
instruct the drive to position the heads over the desired cylinder (called
seeking) andusethe head located overthe surface (head selection) wherethe
operation is to be performed.
Theheadsare mounted onthe actuator, andtheactuatormovesthe headsover
the rotating discs. There are 19 heads-a servo head to sense actuator
positioning and 18 physical data heads used for data transfers to and from the
discs. Asatwo-headparalleldrive, eachdatatransferemploystwophysicaldata
heads simultaneously. Each pair of physical (read/write) heads is known as a
logical head. The actuatorhas avoice coilthat moves in apermanent magnetic
field in response to signals from the servo positioning circuitry. The voice coil
moves the heads in an arc across the rotating discs.
When the drive is not powered on, the heads rest on the disc surface in the
preassignedlanding zone (beyondthedatazone). The actuatorisautomatically
latched in thisposition at shutdown formoving orshipping protection. Whenthe
drive is activated to bring thediscs upto speed, the heads fly on a cushion of air
close to the disc surface.
After arriving at the data track and selecting a logical head, the controller must
locate that portion of the track where the data is to be read or written. The
controller usestrack orientation information it receives on the interface.
Whenthe head isabovethedesiredtrack location,the controllercommandsthe
drive to actually read or write the data. During a read operation, the drive
retrieves data from the discs, processes it, and transmits it to the controller.
During a write operation, the drive receives data from the controller, processes
it, and stores it on the discs.
Thedrive is also capable of recognizing certain errors that may occurduring its
operation. When anerrorisdetected, status informationis availablethroughthe
controller.

7
Section 2. Installation
The information contained in this section describes installation and initial
checkout of the drive.
Site requirements
The site requirements considered are environment, space, power, grounding,
and interface.
Environmental requirements
All environmentalrequirementsforthedriveare listed in Table 2 on thefollowing
page.
Space requirements
The drive is designed to be mounted in one of the three orientations shown in
Figure3. The drivemaybe mounted on its base oron eitherside. The physical
dimensions ofthe drive and optional powersupply are shown in Figure 4. The
drive itself weighs 4.1 kg (9.0 lb).
For details about designing an enclosure to match the drive mounting dimen-
sions, refer to the drive product specification (document 64403502).

8
Table 2. Environmental requirements
Conditions
Operating environment
Temperature
Humidity
Barometric pressure
Non-operating environment
(unpacked)
Temperature
Humidity
Barometric pressure
Transit and storage environmi:rnt
(packed)
Temperature
Humidity
Barometric pressure
Specifications
Range of 10°C to 45°C (50°F to 113°F) with a
maximum change of 20°c (36°F) per hour
Range of 5% to 95% relative
A maximum wet bulb temperature of 26°C (79°F)
no condensation
-305 m to 3,048 m (-1,000 ft to 10,000 ft)
104 kPa to 69 kPa (30 in Hg to 20 in Hg)
Range of -40°C to 60°C (-40°F to 140°F) with a
maximum change of 20°c (36°F) per hour
Range of 5% to 85% relative
A maximum wet bulb temperature of 26°C (79°F)
no condensation
-305 m to 12,192 m (-1,000 ft to 40,000 ft)
104 kPa to 69 kPa (30 in Hg to 20 in Hg)
Range of -40°C to 60°C (-40°F to 140°F) with a
maximum change of 20°c (36°F) per hour
0-::anno nf c;;:o/~ tn ai:;:o;_ r.ol~th1n
1 •'-"11!:::fV '-'1 ~ ,fV l ... .J'OJ IV I ,,,,.dUllVV
-305 m to 12,192 m (-1,000 ft to 40,000 ft)
104 kPa to 19 kPa (30 in Hg to 6 in Hg)

Installation 9
Figure 3. Mounting orientations

10
147mm
5.75 in
Figure 4. Dimensions of the drive
IDrive I

Installation
11
Power requirements
The voltage and current requirements for a single drive are shown in Table3
below. Consult product specification 64403502 before selecting or designing
apowersupply forthedrive. Theproduct specification presents more detailed
requirements including the types of overvoltage and overcurrent protection
needed.
A power supply is available if required for system installation. AC power
requirements are listed in Table 4. Conversion to the different line voltages is
explained in the installation procedures.
Table 3. DC power requirements for the drive
Nominal Values
Specifications
Allowable range* (volts)
Ripple noise
(peak-to-peak millivolts)
Load current range
(amperes)
+5.0 -5.1 +12
+4.85 to
+5.25
100
1.5 to
6.0
+11.4 to
+12.6
100 (spindle motor not running)
300 (motor running but drive not seeking)
0.4to
8.2
* Voltage range must allow for the effects of ripple, noise, transient response,
environmental conditions, and variations in load, in line voltage, and in frequency.
**The IPI Elite discdrive does not require - 5.1 volts. The optional Seagate power
supply has a - 5.1 volt channel to meet the requirements of other versions of the
Elite disc drive.
Table 4. AC power requirements for the power supply
Nominal Values
Specifications
100-120VAC 208-240 VAC
Voltage range
85 to 132 V 175 to 264 V
Nominal line 50/60 Hz 50/60 Hz
Frequency range 48.0
to 62.0 Hz 48.0 to 62.0 Hz
Phase requirements single phase single phase
Power consumed*
130W 130 w
Line current* 1.08 A.RMS 0.625 A.RMS
Power factor* TBD TBD
*Measured at nominal values when discs are rotating and carriage is track-following.

12
Grounding requirements
Asafetyground must be provided by the site AC powersystem. The green wire
(orgreenwire with yellowstripe) in the AC power cord provides the safetyground
connection between the power supply and the site AC power system. The site
AC powersystem must provide the safety ground to earth ground connection.
All site AC power connection points, including convenience outlets for test
equipment, must be maintained at the same safety ground potential.
Interface requirements
Thisdrive is atwo-port device, so it can beshared by two controllers if necessary.
It is designed to be connected in a daisychain 1/0 configuration as shown in
Figure 5. Table5 shows the pin assignments and signal namesforthe 1/0cable
Detailed information about interface lines is given in the reference manual
(publication 83327430).
The two 1/0 connectors at the back of the drive accept the 1/0 cables that
connect it to the system. J31 (port A) and J32 (port B) are the connectors to
whichdaisychain 1/0cables are attached. Each daisychaincable is acontinuous
cable having one connector for each drive it connects to.
Aterminatormust be installed at the end of each daisychain cable. An unused
__ ..... /a.......... :-- -- l/r"\ ,...,...a...I,...,...\ _._.,_,, 1... ..... ...J: ........ Lo..l ..... ...J ...,.,... ...J .... ,...,....,.:J....-..J : .... UC',....a. ... : ... _ ............ ,...:.., ...... ,; ..
fJVI l \I IQVll I~ I IU l/V '"'QUIC~J lllU;::>I. IJC' Ul:>a.un:;u ao:> UC'o:J\,l IUt:iU 111 Vt;;Ull 1~ u IC ""'''"'Ull
board switches."
-Port B --•+I .. • -- Port A ----+-
Terminator Terminator
Figure 5. Daisychain configuration

Installation 13
Refer to the reference manual for guidelines on 1/0 cabling. These guidelines
discuss the use of unshielded cabling inside cabinets and shielded cabling
running between cabinets. They also contain information about constructing
continuous daisychain cabling (including part numbers forthe required cabling
components).
Table 5. 1/0 cable pin assignments
Signal (+}Pin
(-)Pin
Name Number Number
DC Ground 2
Select Out 47 46
Master Out 41 40
Sync Out
23 24
Sync In 33
32
Slave In 17 18
Attention In
9 10
Bus A - Bit 0 39 38
Bus A- Bit 1 37 36
Bus A - Bit 2 15 16
Bus A- Bit 3 49
48
BusA-Bit4 45 44
Bus A - Bit 5 43 42
Bus A - Bit 6
11 12
Bus A - Bit 7 13 14
Bus A - Parity 35 34
Bus B - Bit o 31 30
Bus B - Bit 1 29 28
Bus B - Bit 2 7 8
Bus B - Bit 3 19
20
Bus B - Bit 4 21
22
Bus B - Bit 5
25
50
Bus B - Bit 6 3 4
Bus B - Bit 7 5 6
Bus B - Parity 27 26

14
Unpacking, inspection, and repacking
After removing the packing material, inspect the drive for shipping damage.
Save all packing materials for future use.
The driveis shipped separatelyfrom anyotheritemsordered fortheinstallation.
Unpacking
1. Allow the drive temperature to approach the ambient temperature of the
unpacking area. Ensurethatthe temperature stabilization period meets the
requirements printed on the drive container.
2. Open thepackage and remove the drive from its conductive static shielding
bag, using precautions described in "Electrostatic discharge protection" in
the preface.
3. Check all items against the shipping bill for the required equipment and
hardwareto complete installation. Discrepancies, missing items, damaged
equipment, etc., should be reported to the sales representative from whom
the drive was purchased.
Inspection
Inspect the drive for possible shipping damage. All claimsforshipping damage
should be filed with the carrier involved.
Repacking
If it is necessary to ship the drive, repack the drive with the original packing
materiais (saved during unpacking). Refer to section 5 for instructions.

Installation 15
Installation procedures
With the site requirements completed, the enclosure designed, and the drive
unpacked, you arereadyto beginthe installation. The following procedures are
included in drive installation:
• Setting the circuit board jumpers
• Installing the power supply (if used)
• Attaching an optional bezel
• Mounting the drive
• Connecting the system 1/0 cabling
• Grounding the system
• Synchronizing the spindle
Setting the circuit board jumpers
Caution. Do not remove circuit boards to set jumpers.
Thecircuit boards insidethedrivecontain a numberofjumpersthat must be set
correctly for normal operation of the drive. The following figures contain
information about jumper settings:
• Figure &-identifies jumpers, gives their locations on the 1/0 board, and lists
thepossible settings for normal drive operation for jumpers on the 1/0 board.
• Figure ?-identifies jumpers and givestheirlocations on the control board. It
also lists the possible settings for normal drive operation for jumpers on the
control board.

16
.--------------- Master1Siave (MSj
Master/Slave (MS)
Establishes the dnve as
a master (plug inserted).
IEstablishes the drive as
1
a slave.
•
•
I • I
i • i
Figure 6. 1/0 board jumpers
~---- Loca!!Remote (LR)
.-- Disable R/W Diaonostics (RW)
I - - -
• •
• •
• , • e
• • • • I
Local/Romoto (LR) I
!Establishes the drtve as the remote.
Factory set to this position. Spinup
command from interface is required
to start the drive
Establishes the drive as a local drive.
Disc spinup starts (after a delav)
Iwhen DC power is applied. -
LR
i
AW
i
• •
• •
••••
• • • •
2~_j JI L2~
2< __j --2·
,r;i • !
L!l • '
• • • •
• • • •
Dlsablo Aoad/WrHo Diagnostics (RW) I
Prevents internal diagnostic program
from doing read and write operations.
Required setting if diagnostic cylinder
(2625) is used for customer data.
Enables internal diagnostic program to
~er1orm read and write operations.
actory set to this position.
Microcode 10
These jumpers assign a unique
device connguration code.
1.986 M/Bvte drives
I{This sattinQ applies to standard OEM
I drivAs) See pro~ct spec~ica:tion
164403502for umqi..1e apphcat!Ons.
•
[;]
•
• •
••
• • • •
• •
• •
• • • •
• • • •
• •
i~
•1
-=-1
1- -1-1- I
,.
•l!J•i

Installation 17
ES
I
I S:nAhl,.. ~wopn Onlv nn ~ks I I:::•
•• 11 •••
•
•• 1
IRii!el.1o !tie-f!e1eienc~·ivla.~li3.i (s332'.430l I •
••II•••
•
••I
tor more 1ntormauon acoUl sweep cyc1es.
Each swe'.'lh,segment is part of a controller-driven
·r:i •
• •• ••• • ••
direct seek. is is the factory setting -do not change. ••••
••
••• •••
Each swee\'esegment is either self-initiated or part •
•• •
••
•••
•••
of a control r-driven direct seek. Not supported. •
•• • •• • •• • ••
SCE
Sweep Cycle Enable
Sweep Cycle
Enable {SCE)
~
•
Port B
~---- Wrrte Protect (WRP)
11
Disable Port A (PDO}
Disable Port B {PD1)
JE ::}"·m"-
-~ J4A
Figure 7. Control board jumpers
Enables sweep cycles at the.drive level {some
Icontrollers will not tunct1on w11n sweep cycies enab1ed).
Disable sweep cycles. In this case, use sweep cycles
enabled at the system er subsystem level
•
•
•
•
WRP PD1 ID1
• •
r-1
• •
l.!J
• • •
• •••
Seiect umt iD, write protect, and
~isabie port c;>ption~ by placing
1urnpers as ~nuwn Ut:'IUW.
I
PDO
1
, !DO 1102
, I I I
I• • • • • • i
I• •••••I
Unit Select ID. o • ••• •
•
•••
•
Unit Select ID = 1 •
[!] ••
•
•
••
•
Unii St:"ief;i iD = 2 • •
fil•
•
•
·~·
•
Unit Select ID • 3 •
[!][;] • •
•
••
•1
Unit Select ID • 4 • •·i;i
• •••
Unit Seleci iD ... 5 •
[!] •[!]
• ••
Um! Select ID • 6 • .
[;][;]
• •••
Unit Select ID = 7 •
[;]~
•
••
Enabie writing (normai sening)
• •
• •
Prevent writing {write protected)
~
•
•
r"'l:--1-1- n- ... A •
rel
•
Ul'=>d.UllC' r VI l r'\
l•l•I
•
Enable Port A (factory setting)
lee
•
1·.
•
Disable Port B ::
l:l
•
•
Enable Port B {factory sening)
••• • •
•••
• •

18
Installing the power supply
A power supply and AC power cord are available if desired. The power supply
isconfigured before shipmenttooperatein oneoftwo AC input voltage ranges.
Thevoltageselectplateonthepowersupply (seeFigure8) indicatesthevoltage
range selected priorto shipment. Thevoltage range may be changed by setting
the voltage select switch to the desired range.
Caution. The power supply will be damaged if the voltage select is set for the
low range (100-120 VAC) and a voltage in the high range (208-240
VAC) is applied.
1. Ensure that the AC power cable is disconnected from the power supply.
2. If the correct vottage range is not selected, perform the following steps:
a. Remove the screwsecuring the voltage select plate to the powersupply
and remove the plate from the power supply. Retain the plate and all
hardware.
b. Set the voltage select switch to the desired range.
c. Reverse the voltage selectplateand installtheplate on the powersupply
to lockthe switch in the desired range.
d. Replace the existing AC powercable with the AC power cable specified
for the new operating voltage.
Note. Mounting screwsmust havecompletethread engagement in the power
supply chassis but must not exceed the limits given in the next step.
3. Select mounting screws that meet the following criteria for insertion depth:
• For bottom mounting-2.8 to 6.4 mm (0.110 to 0.250 in)
• For side mounting-5.0 mm (0.2 in) maximum
4. Mount the power supply in the desired location with four 6-32 screws. Use
tapped mounting holes in the bottom of the power supply or in the sides of
the power supply.
5. Connect a ground strap between the chassis safety ground screw on the
power supply and cabinet ground.
Caution. The AC power cord must be replaced if the voltage range is
changed. Refer to section 4 for information about ordering the
replacement AC power cord.
6. Attach the AC powercordtothepowersupply connectorJ 1. Do not connect
the power cord to site power until directed.