Pioneer SCSI-2 - Manual (Page 108)

Read CD MSF
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2.23 Read CD MSF (B9h)
IMPORTANT: This command applies only to models DRM-602X, DRM-624X, DR-U124X,
DR-UA124X
The Starting M field, the Starting S field, and the Starting F field specify the absolute MSF
address at which the Read operation shall begin.
The Ending M field, the Ending S field, and the Ending F field specify the absolute MSF
address where the Read operation shall end. All contiguous sectors between the starting and the
ending MSF address shall be read.
A starting MSF address equal to an ending MSF address prevents a read operation. This shall not
be considered an error. If the starting MSF address is greater than the ending MSF address, the
command shall be terminated with Check Condition status. The sense key shall be set to
ILLEGAL REQUEST.
If the starting address is not found, or if a not ready condition exists, the command shall be
terminated with Check Condition status.