Write Sector(S) Command Protocol; Commands Without Data Transfer - Fujitsu MHN2100AT - Mobile 10 GB Hard Drive Product Manual

Interface
Figure 5.5 WRITE SECTOR(S) command protocol
For transfer of a sector of data, the host needs to read Status register
(X'1F7') in order to clear INTRQ (interrupt) signal. The Status
register should be read within a period from the DRQ setting by the
device to starting of the sector data transfer. Note that the host does
not need to read the Status register for the first and the last sector to
be transferred. If the timing to read the Status register does not
meet above condition, normal data transfer operation is not assured
guaranteed.
When the host issues the command even if the drive requests the
data transfer (DRQ bit is set), or when the host executes resetting,
the device correct operation is not guaranteed.

5.4.3 Commands without data transfer

Execution of the following commands does not involve data transfer between the
host and the device.
RECABLIBRATE
5-94
IMPORTANT
C141-E120-02EN