Pioneer SCSI-2 - Manual (Page 116)

Read Header
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2.26 Read Header (44h)
Operation Code is (44h)
MSF
Set to 1 indicates that the absolute CD-ROM address field of the returned header data will
indicate the MSF address where the specified logical block is found.
If MSF bit is equal to 0, the absolute CD-ROM Address field of the returned header data
gives the logical block address of the first logical block in the physical sector where the
specified logical block is found. Note: This address may be different from the specified
logical block address in CDB if the block length is either 512 or 1024 bytes.
Logical Block Address
Specifies the logical block at which the read header operation will begin. A logical block
size smaller than 2048 bytes, will be mapped into the appropriate physical block from
which the data would have been read.
Allocation Length is the length of header data to be returned (08h).
This command requests the drive to return the header data of the specified logical block to allow
the system or applications to determine the mode of the specified block.
If the specified block is on an audio track, a Check Condition status is returned.
CD-ROM Data Mode
The CD-ROM Data Mode field will return CD-ROM Data Mode of the specified logical
block.