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Articles / TULARC / PC info / Hard Drives / HITACHI Hard Drives / |  |
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Hard Drive: HITACHI: DK312C-25 240MB 3.5"/HH SCSI1 SE |
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D K 3 1 2 C - 2 5 HITACHI
NO MORE PRODUCED Native| Translation
------+-----+-----+-----
Form 3.5"/HH Cylinders 1076| | |
Capacity form/unform 240/ MB Heads 12| | |
Seek time / track 16.8/ ms Sector/track 38| | |
Controller SCSI1 SINGLE-ENDED Precompensation
Cache/Buffer 32 KB LOOK-AHEAD Landing Zone
Data transfer rate 1.500 MB/S int Bytes/Sector 512
4.000 MB/S ext SYNC
Recording method RLL 2/7 operating | non-operating
-------------+--------------
Supply voltage 5/12 V Temperature *C 5 45 | -20 60
Power: sleep W Humidity % 8 80 | 8 90
standby W Altitude km |
idle W Shock g 3 | 40
seek W Rotation RPM 3600
read/write W Acoustic dBA
spin-up W ECC Bit
MTBF h 150000
Warranty Month
Lift/Lock/Park YES Certificates
HITACHI DK312C-20/25 PRODUCT MANUAL K2500324
+------------------------------------------------------------+ | +-J5----1 4---6 +--+ | 12-------+ 3---1 JP126 JP121 1-+XXX 22-+ 3-+XXX || | +-+-+ XXX || |J3 TM117| | XXX || | | | XXX || | | | XXX |+-1 +---+ XXX ++ XXX J1 ++LED XXX | XXX | XXX | 2 1 | +--+ | JP114 1--2| | +----------------1 +------1 |J6|| | 26----------------+ 10-----+ JP109 11--12 +------------------------------------------------------------+
HITACHI DK312C-20/25 PRODUCT MANUAL K2500324
Jumper Setting
==============
Jumper Plug Installation
------------------------
The following jumpers are accessible to the user:
JP114 9 14 or J6 1 6 SCSI ID setting jumper
JP114 15 16 SCSI bus parity jumper
JP121 1 4 Terminator power on/off
J6 9 10 WRITE PROTECTED setting jumper
JP114 3 4 MOTOR START/STOP setting jumper
JP114 1 2 Look ahead cache function setting jumper
JP126 1 6 Look ahead cache function segment setting jumper
J6 7 8 SCSI ID POLARITY INVERTED setting jumper
The DK312C jumpers other than listed above are installed by the
manufacturer and must not be replaced by the user.
JP114 SCSI ID setting jumper ---------------------------- 26----25 + +----+ + 23 26 Drive type setting jumper +----+ + +----+ 18xxxx17 17-18 Jumper plug always installed (Factory use) +----+ 15-16 SCSI bus parity setting jumper 14xxxx13 + 13-14 SCSI ID 4 +xxxx+ + 9 14 SCSI ID set 11-12 SCSI ID 2 10xxxx9 + 9-10 SCSI ID 1 +----+ +----+ +xxxx+ 3-4 MOTOR Start/Stop Option set 2xxxx1 1-2 Look ahead cash function set. +----+
SCSI ID JP114, J6
-----------------
Pins
9-10 |11-12 |13-14 |SCSI ID#
------+------+------+--------- This table shows SCSI ID Setting
CLOSED|CLOSED|CLOSED|SCSI ID 0 Jumpers without setting SCSI ID
OPEN |CLOSED|CLOSED|SCSI ID 1 Polarity inverted by the jumper plug
CLOSED|OPEN |CLOSED|SCSI ID 2 between J6 No. 7 and No. 8.
OPEN |OPEN |CLOSED|SCSI ID 3
CLOSED|CLOSED|OPEN |SCSI ID 4
OPEN |CLOSED|OPEN |SCSI ID 5
CLOSED|OPEN |OPEN |SCSI ID 6
OPEN |OPEN |OPEN |SCSI ID 7
SCSI ID can be set either JP114 or J6. Please avoid setting SCSI ID
by both JP114 and J6. No jumper plug must be installed in either
JP114 (No. 9-14) or J6 (No. 1-6).
J6 |
1----+2 + 1-2 SCSI ID 1
+----+ + 1 6 SCSI ID 3-4 SCSI ID 2
+----+ + 5-6 SCSI ID 4
7----+ 7- 8 SCSI ID POLARITY INVEVTED set
+----+ 9-10 Write Protected set
11----+12 11-12 External LED terminal
+----+ (11 o---+<----o 12)
+--+
+--+J2
JP114 23-26 Drive type setting jumper
-------------------------------------
26+----+25 26+----+25 The drive type setting jumpers are
+----+ +xxxx+ numbered as shown according to each
24+----+23 24+----+23 model. These jumpers are set by the
DK312C-25 DK312C-20 manufacturer at shipment and changing
the setting positions are not allowed.
JP114 15-16 SCSI bus parity jumper
----------------------------------
15-16 CLOSED Disables SCSI bus parity
OPEN Enables SCSI bus parity
JP121 Terminator Power on/off
------------------------------
Pins 3-4
CLOSED +5V source for terminator is supplied only from the SCSI
bus.
Pins 1-2
x CLOSED +5V source for terminator is supplied only from the
drive controller.
The jumper plug between NO.3 and 4 will not be inserted (no
terminator provided) at shipment.
NOTE
Terminator power source is supplied to the terminator register
module from the host that pulls up the SCSI interface signald in the
controller so that the SCSI bus lines will not be pulled down when
DK312C power is turned on.
J6 9-10 Write Protection jumper
-------------------------------
9-10 CLOSED Write protected. The disk can be only read and cannot be
written.
9-10 OPEN Read or write. The disk is enabled for both read and
write. (Shipment)
JP114 3-4 Motor Start/Stop jumper
---------------------------------
3-4 CLOSED The motor start/stop option is not selected. The spindle
motor is started when DK312C power is turned on.
(Shipment)
OPEN The motor start/stop option is selected. The spindle
motor can be started or stopped by using SCSI command.
When the motor start/stop option is selected, the drive enters the
motor stop state when its power is turned on. Use the Start/Stop Unit
(1BH) command to start or stop the drive.
NOTE
When motor start/stop option is not used, the controller does not
respond to the host about 35 sec from Power turn-on to Drive Ready.
JP114 1-2 Look Ahead Cache Jumper
---------------------------------
1-2 CLOSED The Look Ahead Cache function is not selected. The DK312C
uses a 32 KB buffer size.
NOTE: Sets 1 for the number of the segments when not-
selecting the Look Ahead Cache function.
OPEN Selects the Look Ahead Cache function. The DK312C operates
with the buffer size (number of the segments) specified on
JP126.
JP114 is set at the factory not to select the Look Ahead Cache
function. Setting the Look Ahead Cache function operates immediately
after turning on the power.
Use the MODE SELECT (15) command to execute or stop this function.
JP126 1 6 Look Ahead Cache function ----------------------------------- +---+ 3|o o|4 Sets 1 for the number of the Look Ahead Cache function 2|x x|5 segments. The unit uses a 32KB buffer size. 1|X X|6 +---+ +---+ 3|o X|4 Sets 2 for the number of the Look Ahead Cache function 2|x x|5 segments. The unit uses a 16KB buffer size. 1|X o|6 +---+ +---+ 3|x x|4 Sets 4 for the number of the Look Ahead Cache function 2|X X|5 segments. The unit uses a 8KB buffer size. 1|o o|6 +---+
The terminator of the DK312C other than the last drive of SCSI Daisy
Chain MUST be removed.
Number of the Look Ahead Cache function segments is set to 1 at the
factory.
NOTE
The jumper setting for Look Ahead Cache function has priority to the
Mode Select (15) command. When changing the jumper setting, re-issue
the Mode Select (15) command to match the command to the number of
the segments.
J6 7-8 SCSI ID Polarity Inverted setting jumper
-----------------------------------------------
7-8 OPEN Pins (JP114, J6)
ID 1 | ID 2 | ID 4 |SCSI ID#
------+------+------+---------
CLOSED|CLOSED|CLOSED|SCSI ID 0
------+------+------+---------
OPEN |CLOSED|CLOSED|SCSI ID 1
------+------+------+---------
CLOSED|OPEN |CLOSED|SCSI ID 2
------+------+------+---------
OPEN |OPEN |CLOSED|SCSI ID 3
------+------+------+---------
CLOSED|CLOSED|OPEN |SCSI ID 4
------+------+------+---------
OPEN |CLOSED|OPEN |SCSI ID 5
------+------+------+---------
CLOSED|OPEN |OPEN |SCSI ID 6
------+------+------+---------
OPEN |OPEN |OPEN |SCSI ID 7
7-8 CLOSED Pins (JP114, J6)
ID 1 | ID 2 | ID 4 |SCSI ID#
------+------+------+---------
CLOSED|CLOSED|CLOSED|SCSI ID 7
------+------+------+---------
OPEN |CLOSED|CLOSED|SCSI ID 6
------+------+------+---------
CLOSED|OPEN |CLOSED|SCSI ID 5
------+------+------+---------
OPEN |OPEN |CLOSED|SCSI ID 4
------+------+------+---------
CLOSED|CLOSED|OPEN |SCSI ID 3
------+------+------+---------
OPEN |CLOSED|OPEN |SCSI ID 2
------+------+------+---------
CLOSED|OPEN |OPEN |SCSI ID 1
------+------+------+---------
OPEN |OPEN |OPEN |SCSI ID 0
SCSI ID can be set either JP114 or J6. Please avoid setting SCSI ID
by both JP114 and J6. No jumper plug must be installed in either
JP114 (No. 9-14) or J6 (No. 1-6).
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