Information Technology Reference
In-Depth Information
Problems with Specific SCSI Commands
Specific commands challenge some devices:
INQUIRY
The device crashes if the ALLOCATION LENGTH parameter doesn't
equal 36.
The device returns an incorrect value in the VERSION field (byte 2). See
the SPC specification or other relevant command-set documents for the cor-
rect values for your device.
The device returns 05h (SPC-3) in the VERSION field but the device
doesn't support the REPORT LUNS command (mandatory for SPC-3).
The device returns an incorrect value in the ADDITIONAL LENGTH
parameter.
When a UNIT ATTENTION condition exists, the device fails the com-
mand and returns a sense key of UNIT ATTENTION. (The device should
perform the command and should not report or clear the UNIT ATTEN-
TION condition.)
MODE SENSE
The device crashes if the ALLOCATION LENGTH parameter doesn't
equal 192.
When the PAGE CODE parameter equals 3Fh (Return all subpage 00h
mode pages in page_0 format), the device crashes.
The device doesn't implement all mode pages required by relevant specifica-
tions.
The device doesn't implement all mandatory versions of the command.
Read/write devices that are bootable and that don't have a PDT of 05h
(CD/DVD drive) must support MODE SENSE(10).
PREVENT ALLOW MEDIUM REMOVAL
On receiving the command, the device stops functioning or behaves as if the
storage media is removed even if it isn't.
READ
The device doesn't implement all mandatory versions of the command.
Devices that comply with SBC-2 or SBC-3 should implement both
READ(6) and READ(10).
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