Pioneer SCSI-2 - Manual (Page 162)

Verify(10)
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2.42 Verify(10) (2Fh)
Operation code is (2Fh).
Logical Block Address is the address at which the verify operation shall begin.
Verification Length is the number of logical blocks to be verified.
This command requests the drive to check the specified blocks on the disc based upon the error
recovery parameter setting (see MODE SELECT command). No data transfer on the SCSI bus
occurs.
NOTE: The BlkVry (Blank verify), BytChk (Byte Check) and RelAdr bits in byte 1 are not
supported, and should be set to 0.