IBM Deskstar 120 GXP, Specifications

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11.10 Initialize Device Parameters (91h)
see below Status 1 0 0 1 0 0 0 1 Command
- - - - - - - - Device/Head 1 - 1 D H H H H Device/Head
- - - - - - - -
Cylinder High
- - - - - - - -
Cylinder High
- - - - - - - - Cylinder Low - - - - - - - - Cylinder Low
- - - - - - - - Sector Number - - - - - - - - Sector Number
- - - - - - - -
Sector Count
V V V V V V V V
Sector Count
- - - - - - - - Error - - - - - - - - Feature
- - - - - - - - Data - - - - - - - - Data
7 6 5 4 3 2 1 0
Register
7 6 5 4 3 2 1 0
Register
Command Block Input
Registers
Command Block Output
Registers
V – 0 – – 0 V 0 0 0 V 0 0 0 0 0
ERR IDX COR DRQ DSC DF RDY BSY AMN T0N ABT 0 IDN 0 UNC CRC
0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7
Status Register Error Register
Figure 108. Initialize Device Parameters Command (91h)
The Initialize Device Parameters command enables the host to set the number of sectors per track and
the number of heads minus 1 per cylinder. Words 54-58 in Identify Device Information reflect these
parameters.
The parameters remain in effect until the following events occur:
!
Another Initialize Device Parameters command is received.
!
The device is powered off.
!
Soft reset/Hard reset has occurred and the Set Feature option of CCh is set instead of 66h.
Output parameters to the device
Sector Count
The number of sectors per track. Zero means that there are no sectors per track rather
than 256 sectors per track.
H The number of heads minus 1 per cylinder. The minimum is 0 and the maximum is 15.
The following condition needs to be satisfied to avoid invalid number of cylinders beyond FFFFh:
(Total number of user addressable (sectors)/((Sector Count) x (H+1)) = <FFFFh
The total number of user addressable sectors is described in Identify Device command.
Deskstar 120GXP hard disk drive specifications
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