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- WD1002S-WX2 Hard Drive Controller
-
-
-
-
- The following information on the Western Digital Controller is for
- the WD1002S-WX2 taken from the Western Digital Installation Guide.
- If you need help doing a low-level format on the drive, please
- leave a message in the Hard Drive Conference, Sparta PCBoard
- (201) 729-7056.
-
-
- The BIOS ROM is used to define individual disk drive parameters.
- Currently there are two varieties of BIOS ROMs available. The
- standard BIOS ROM contains a selection of four sets of drive
- parameters that can be used with most existing disk drives.
-
- In addition to this same selection of parameters, another BIOS
- ROM, called Auto Config BIOS ROM, allows manual assignment and
- modification of these drive parameters; has the ability to load
- a drive defect list; and lets the user logically format one disk
- drive as two virtual drives.
-
- Both versions of the BIOS ROM contain four drive configuration
- tables or BIOS tables as listed below:
-
- BIOS Drive Tables contained within the following BIOS ROMS
- Standard - WD62-000042-013
- Auto Config - WD62-000043-010
-
- Table 0
- Specifications Drive Types
- Drive Capacity 20MB Microscience HH725/HH325
- Cylinders 612 Tandon TM262/362
- Heads 4
- RWC 613(none)
- WPC 613(none)
- Step Rate Option 5
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- Table 1
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- Drive Capacity 10MB Miniscribe 3012/3212
- Cylinders 612
- Heads 4
- RWC 128
- WPC 128
- Step Rate Option 5
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- Table 2
-
- Drive Capacity 20MB CDC 9415-525AT/9415-528
- Cylinders 612 Miniscribe 3425
- Heads 4 Mivil M125/M225/M325
- RWC 613(none) Seagate ST225
- WPC 128
- Step Rate Option 5
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- Table 3
-
- Drive Capacity 10MB Fujitsu m2233
- Cylinders 306 LaPine 3065/3512/3522
- Heads 4 Microscience HH612/HH312
- RWC 306(none) Miniscribe 2012
- WPC 0 (all) Rodime 252/352
- Step Rate Option 5 Seagate ST412
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- SW1 Jumper Positions 1 - 4
-
- BIOS Table Drive 1 Drive 0
- SW 1-1 SW 1-2 SW 1-3 SW 1-4
- 0 Close Close Close Close
- 1 Open Close Open Close
- 2 Close Open Close Open
- 3* Open Open Open Open
-
- *Shipping Configuration
-
- SW1 Jumper Positions 5 - 8
-
- SW 1-8 Open Reserved for BIOS ROM
- SW 1-7 Open Reserved for BIOS ROM
- SW 1-6 Open Reserved for BIOS ROM
- SW 1-5 Open Reserved for BIOS ROM
-
-
- The following jumpers cover the W1 - W7 jumper positions
-
- Jumper Pin Connects Status
- W1 2-1 Normal*
- 2-3 Factory Test Only
-
- W2 2-1 Normal*
- 2-3 Factory Test Only
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- W3 Closed BIOS ROM Enabled*
- Open BIOS ROM Disabled
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- W4 2-3 Device Address 320H*
- 2-1 Device Address 324H
-
- W5 2-1 BIOS ROM Size 32K or 64K**
- 2-3 BIOS ROM Size 16K
-
- W6 2-3 Reduced Write Current (8 heads)*
- 2-1 Head Select 3 (16 heads)
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- W7 2-1 INTRQ to INTRQ 5 on host connector**
- 2-3 INTRQ to INTRQ 2 on host connector
-
- * - As Shipped - Jumper is installed
- ** - As Shipped - Jumper is installed, Pins 1 and 2 are joined via an
- etch on the PCB. To change, the etch must be carefully
- cut and a jumper installed.
-
-
- Step Rates
- The WD1015 Control Processor uses the CCB Option Byte to establish
- the actuator step rate. This step rate is defaulted to either 70 or
- 75 microseconds on the installed version of the Control Processor. It
- can be modified by the Auto-Config BIOS ROM. The control processor
- is the chip located at U11 on the circuit board.
-
- An older version of the control processor, P/N WD1015-14, supports a
- maximum of 8 heads and is completely suitable for the lower capacity
- ST506 type disk drives. The default step rate is 70 microseconds.
-
- Today's control processor, the WD1015-24, supports up to 16 heads. It
- includes controller support to the DMA and Syquest removable drives.
- Other differences include: it no longer performs the unnecessary
- controller self-test after power-on or soft resets; the processor allows
- faster step rates; and the default step rate is 75 microseconds.
-
- The Auto-Config BIOS ROM can be used to change the step rate of either
- the WD1015-14 or -24 control processors. Table 5 lists the available
- step rates for both the WD1015-14 and the WD1015-24. Overall system
- performance will be enhanced by selecting the fastest possible step rate
- supported by the attached drive.
-
- Table 5
-
- WD1015-14 Step Rates
- DEC BIN Step Rate Comments
- 0 000 3 ms
- 1 001 3 ms
- 2 010 3 ms
- 3 011 3 ms
- 4 100 200 us
- 5* 101 70 us Standard Buffered Seek Rate
- 6 110 3 ms
- 7 111 3 ms
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- WD1015-24 Step Rates
- 0 000 3 ms
- 1 001 45 us
- 2 010 60 us
- 3 011 18 us
- 4 100 210 us
- 5* 101 75 us Standard Buffered Seek Rate
- 6 110 30 us
- 7 111 18 us
-
- * Default value in WD BIOS ROMS
-