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The Drive only supports an interleave factor of 1:1, and may ignore any other specified interleave,
without returning an error.
Format Track Sector Count
The drive will return an Abort error if the specified sector count is not the same as the number of
sectors per track designated by the drive in the Initialize Drive Parameters command, or default
setting as reported by Identify Drive command.
Format Track Sector Number
The drive will return an Abort error if any sector number in the format table is zero or greater
than the actual number of sectors per track, or the same sector number is used more than once in
the format table. The drive always operates with sectors numbered consecutively between one
and the number of sectors per track.
Initialize Drive Parameters
The parameters specified in the Initialize Drive Parameters command are only in effect until the
next power off, soft reset, or hard reset operation. Afterwards, the default parameters in the
Identify Drive information will be in effect.
Seek Overlap
The drive will wait for the seek to complete before interrupting the host. Therefore, no seek
overlap can occur. This will be transparent to the host except that performance may be degraded
in certain environments where the host could perform other work while waiting for seek
complete, such as multitasking operating systems.
Registers
Address
Input Register
1F0h
Data
1F1h
Error
1F2h
Sector Count
1F3h
Sector Number
1F4h
Cylinder Low
1F5h
Cylinder High
1F6h
Drive/Head
1F7h
Status
3F6h
Alternate Status
3F7h
Drive Address
The host uses the register interface to communicate to and from the drive. The registers are
accessed through the host port addresses shown.
The host should not read or write any registers when the Status Register BSY bit=1.
Output Register
Data
Features
Sector Count
Sector Number
Cylinder Low
Cylinder High
Drive/Head
Command
Device Control
Not Used
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