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Chapter 10
10-2-2 SCSI COMMANDS
The host sends SCSI commands to the device via the Command Descriptor Block (CDB).
These commands set specific requests for transfer of blocks of data and status, and control
information such as a device’s capacity and readiness to exchange data. The μC/USB MSC
10
Device supports the following subset of SCSI Primary and Block Commands detailed in
Table 10-3.
SCSI Command
INQUIRY
TEST UNIT READY
READ CAPACITY (10)
READ (10)
WRITE (10)
VERIFY (10)
MODE SENSE (6) and (10)
REQUEST SENSE
PREVENT ALLOW MEDIA REMOVAL
Function
Requests the device to return a structure that contains information
about itself. A structure shall be returned by the device despite of the
media’s readiness to respond to other commands. Refer to SCSI
Primary Commands documentation for the full command description.
Requests the device to return a status to know if the device is ready to
use. Refer to SCSI Primary Commands documentation for the full
command description.
Requests the device to return how many bytes a device can store.
Refer to SCSI Block Commands documentation for the full command
description.
Requests to read a block of data from the device’s storage media.
Please refer to SCSI Block Commands documentation for the full
command description.
Requests to write a block of data to the device’s storage media. Refer
to SCSI Block Commands documentation for the full command
description.
Requests the device to test one or more sectors. Refer to SCSI Block
Commands documentation for the full command description.
Requests parameters relating to the storage media, logical unit or the
device itself. Refer to SCSI Primary Commands documentation for the
full command description.
Requests a structure containing sense data. Refer to SCSI Primary
Commands documentation for the full command description.
Requests the device to prevent or allow users to remove the storage
media from the device. Refer to SCSI Primary Commands
documentation for the full command description.
Table 10-3 SCSI Commands
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