10.8.16 Initialize Device Parameters (91h)
COMMAND CODE | 1 0 0 1 0 0 0 1 | REGISTER | |
| REGISTER SETTING | NORMAL COMPLETION | |
DR | drive number | no change | |
CY |
|
| no change |
HD | total number of | no change | |
SN | number of sector per track | no change | |
SC |
|
| no change |
FT |
|
| no change |
This command specifies the number of sectors per track and the number of heads per cylinder to set head switching point and cylinder increment point. Specified values affect Number of the current logical heads, Number of logical sectors per track, which can be read by Identify Device Command.
On issuing this command, the content of CY register shall not be checked. This command will be terminated with ABORT error when it is issued on a invalid HD or SC register setting ( SC register=0 or the combination of HD and SC register exceeds the drive parameter.
Any drive access command should accompany correct HD, SN register with heads and sectors within the number specified for this command. Otherwise, it results in “ID not found” error. If the number of heads and drives is within the specified number, command gives parameter to convert an address to access into Logical Block Address (LBA). “ ID Not Found”error also occur when this LBA exceeds the total number of user addressable sectors. The command does not affect LBA address mode.
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