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The data returned in the command block registers is the maximum device size as shown in the following
tables.
- CHS Mode
Maximum sector number and maximum head number are fixed values, and the values are 16 and 63 for
DK23CA-30F/30
/15, 15 and 63 for
Task File Registers
Cylinder High
Cylinder Low
Device/Head
Sector Number
- LBA Mode
Maximum LBA issued by host is not used for the Maximum LBA in the device. The device adopts logical head
and sector numbers that can be divided, and posts the values to the command block registers.
Task File Registers
Cylinder High
Cylinder Low
Device/Head
Sector Number
- Identify Device Command and Initial Device Parameter
Number of logical cylinder of Identify device command data word 1 posts the value set via this command.
In case of maximum LBA in LBA mode, the Number of logical cylinder of Identify device command data
word 1 is (maximum LBA)/(16 x 63) for DK23CA-30F/30/15, (maximum LBA)/(15 x 63) for DK23CA-75.
In case of logical head number and SPT changed by Initial Device Parameter command, the Identify
Device Word 54 Number of current cylinders is posted by the following calculation method.
CHS Mode
DK23CA-30F/30/15:
Current Cylinder = (Maximum Logical Cylinder + 1) x 16 x 63 / (Current Head x Current SPT)
DK23CA-75:
Current Cylinder = (Maximum Logical Cylinder + 1) x 15 x 63 / (Current Head x Current SPT)
LBA Mode Current Cylinder = (Maximum LBA +1)/ (Current Head x Current SPT)
Current Head: Identify Device Word 55 Number of current heads
Current SPT: Identify Device Word 56 Number of current sectors per track
K6602637
Rev.3
02.27.01
DK23CA-75
.
7
6
5
Maximum Cylinder High
Maximum Cylinder Low
-
0
-
Maximum Sector Number
7
6
5
Maximum LBA Bit23 –16
Maximum LBA Bit15 – 8
-
1
-
Maximum LBA Bit7 - 0
4
3
2
1
DRV
Maximum Head
4
3
2
1
DRV
Maximum LBA
Bit27 - 24
- 84 -
0
0
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