Mass storage demo
6.3.2
UM0424
Small computer system interface (SCSI)
The SCSI command set is designed to provide efficient peer-to-peer operation of SCSI devices like, for example, hard desks, tapes and mass storage devices. In other words these are used to ensure the communication between an SCSI device and an operating system in a PC host.
Table 15
shows SCSI commands for removable devices. Not all commands are shown. For more information, please refer to the SPC and RBC specifications.
Table 15.
SCSI command set
Command name OpCode
Command support
(1)
Description
Inquiry
Read Format
Capacities
Mode Sense (6)
Mode Sense (10)
Prevent\ Allow
Medium Removal
Read (10)
0x12
0x23
0x1A
0x1E
0x28
M
M
M
M
M
M
Get device information
Report current media capacity and formattable capacities supported by medium
Report parameters to the host
Report parameters to the host
Prevent or allow the removal of media from a removable media device
Transfer binary data from the medium to the host
Read Capacity
(10)
Request Sense
Start Stop Unit
Test Unit Ready
Verify (10)
Write (10)
0x25
0x03
0x1B
0x00
0x2F
0x2A
M
O
M
M
M
M
Report current medium capacity
Transfer status sense data to the host
Enable or disable the Logical Unit for medium access operations and controls certain power conditions
Request the device to report if it is ready
Verify data on the medium
Transfer binary data from the host to the medium
1. Command Support key: M = support is mandatory, O = support is optional.
Reference
SPC-2
SPC-2
SPC-2
SPC-2
SPC-2
RBC
RBC
SPC-2
RBC
SPC-2
RBC
RBC
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