Pioneer SCSI-2 - Manual (Page 20)

CD-ROM SCSI-2 COMMAND REFERENCE MANUAL VERSION 3.1 (OB-U0077C)
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The drive terminates the DATA IN phase when the specified number of bytes have been
transferred or, in the case when the bytes exceed the number of bytes the drive wishes to transfer,
the DATA IN phase is terminated when the number of bytes prepared have been transferred.