180 Product Manual - Disc Drive SCSI-2/SCSI-3 Interface (Vol. 2; Ver. 2), Rev. E
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[3] The Defect List format field indicates the defect data format preferred by the initiator. The meaning is the
same as the Defect List Format field in the Format command (indicated in Table 5.2.1-3)
The Defect List format bits (bits 2, 1, 0 in the CDB) should be; 1 0 0, respectively, to signify a defect list
in the Bytes from Index format, or, 1 0 1, respectively to signify a defect list in the Physical Sector format.
If neither of these two, the disc drive responds with the defect list in the drives default format (physical
sector) and create the check condition status with Recovered Error Sense Key [1h] and additional sense
error code 1C at the end of the Read Defect Data transfer.
[4] Allocation Length specifies the number of bytes the initiator has allocated for the returned defect data. An
Allocation Length of zero indicates that no Read Defect Data shall be transferred. Any other value indi-
cates the maximum number of bytes to be transferred. The disc drive shall terminate the Data In phase
when the Allocation Length bytes have been transferred or when all available defect data has been
transferred to the initiator, whichever is less.
[5] See “Control Byte” paragraph 4.2.6.
This command is intended to be used only with the Format Unit command (Section 5.2.1.2). The initiator
should not interpret or act upon this list except to resend this list as defect data in a Format Unit command. It
is not possible to relate actual physical locations to logical block addresses that are given in connection with
other commands.
The format Defect Data header and Defect Data Descriptor bytes returned are shown in Table 5.2.2-8b.
The first 4 bytes returned are the Defect List Header. The P bit, G bit, and Defect List Format fields indicate
the defect format actually returned by the disc drive. The definitions are the same as for byte 2 of the Read
Defect Data Command Descriptor Block (Table 5.2.2-8a).
The Defect List Length specifies the total length in bytes of all the defect descriptors available from the disc
drive. If the Allocation Length of the CDB is too small to transfer all of the defect descriptors, the Defect List
Length is not adjusted to reflect the truncation. The drive does not create the CHECK CONDITION status.
The Defect Descriptors are not required to be in ascending order.
