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Read Header

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Operation Code is (44h)

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.

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.

The CD-ROM Data Mode field will return CD-ROM Data Mode of the specified logical

block.