Product Manual - Disc Drive SCSI-2/SCSI-3 Interface (Vol. 2; Ver. 2), Rev. E
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The INQUIRY command is typically used by the initiator after a reset or power-up condition to determine the
device types for system configuration. To minimize delays after a reset or power-up condition, the standard
INQUIRY data is available without incurring any media access delays. Since the disc drive stores some of
the INQUIRY data on the device media it may return zeros or ASCII spaces (20h) in those fields until the data
is available.
The INQUIRY data may change as the disc drive executes its initialization sequence or in response to a
CHANGE DEFINITION command. For example, the disc drive may contain a minimum command set in its
non-volatile memory and load its final firmware from the medium when it becomes ready. After it has loaded
the firmware it may support more options and therefore return different supported options information in the
INQUIRY data.
Disc Drive Inquiry Data
The disc drive standard INQUIRY data contains 36 required bytes, followed by a number of bytes of disc
drive specific data that is drive dependent. See individual drive Product Manual. The standard INQUIRY data
is given in Table 5.1.1-8.
