Defect List Formats - Seagate SCSI Interface Product Manual

SCSI Interface Product Manual, Rev. J
[2] Pattern Type. Table 44 gives pattern type information.
Table 44: Initialization Pattern Type
Pattern Type Description
00h Use default pattern. If the initialization pattern length is not zero, this is an error and
the drive shall terminate the command with Check Condition status. The sense key
shall be set to Illegal Request and the additional sense error code shall be set to
Invalid Field In Parameter List.
01h Use pattern supplied by host computer. If the initialization pattern length is zero, this is
an error and the drive shall terminate the command with Check Condition status. The
sense key shall be set to Illegal Request and the additional sense error code shall be
set to Invalid Field In Parameter List.
02h–7Fh Reserved.
80h–FFh Vendor specific.
[3] The Initialization Pattern Length field indicates the number of bytes contained in the initialization pattern. If
the length exceeds the current logical block size this is an error and the drive shall terminate the command
with Check Condition status. The sense key shall be set to Illegal Request and the additional sense error
code shall be set to Invalid Field In Parameter List. The initialization pattern is sent by the host for the drive
to write in each logical block by the format command.
5.5.2.3

Defect List formats

This section describes the format of the defect list that follows the Defect List Header described in Table 41.
Three formats are possible:
• Block format (Seagate drives do not support the block format, except as a customer special)
• Bytes from Index format (see Table 46)
• Physical Sector format (see Table 47)
Table 45: Defect Descriptors
0-n Defect Descriptor Bytes
(Refer to Tables 46 and 47 for formats)
Table 46: Defect Descriptor Bytes—Bytes from Index format
Byte
Number Description
0 Cylinder Number of Defect (MSB)
1 Cylinder Number of Defect
2 Cylinder Number of Defect (LSB)
3 Head Number of Defect
4 Defect Bytes from Index (MSB)
5 Defect Bytes from Index
6 Defect Bytes from Index
7 Defect Bytes from Index (LSB)
For defects to be specified in the Bytes from Index format, the Defect List Format field (Byte 1, bits 2, 1, 0) must
be 100 (binary) (see Tables 38 and 39).
Each Defect Descriptor for the Bytes from Index format specifies the beginning of an eight bit (1 byte) defect
location on the medium. Each defect descriptor is comprised of the cylinder number of the defect, the head
number of the defect, and the number of bytes from Index to the defect location (defect bytes from Index).
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