Seagate Medalist 2160N (ST52160N), Product Manual

Page: 52 / 138

3.4.4.3 Defect list header and defect list
The defect list, shown below, contains a 4-byte header, followed by one
or more defect descriptors. Byte 1 of the defect list header determines
whether the P and C defects are reallocated.
Bytes
Bits
7 6 5 4 3 2 1 0
0 0 0 0 0 0 0 0 0
1 FOV DPRY DCRT STPF 0 0 0 0
2–3 Defect list length
4– n Defect descriptor
Byte 1 If the FOV bit is 1, the DPRY, DCRT and STPF bits are
interpreted. If the FOV bit is 0, the DPRY, DCRT and STPF
bits must be zeros.
If the DPRY bit is 0, the defects described in the PList are
reallocated during formatting. The drive sends a check
condition status if it cannot find the PList. If DPRY is 1, the
PList is maintained but the sectors are not reallocated.
If the DCRT bit is 1, the drive does not verify the data written
during the format. Therefore, no CList for this format is
created or reallocated. If the DCRT is 0, the drive verifies
the data written during the format, creates a CList and
reallocates sectors that were unrecoverable.
If the STPF bit is 1, the drive stops formatting if it encounters
an error while accessing either the P or G defect list. If the
STPF bit is 0, the drive continues formatting even though it
has encountered an error while accessing either the P or G
defect list.
Bytes 2–3 The defect list length is the length, in bytes, of the defect list
that follows the header. For each sector to be reallocated,
the defect list contains one defect descriptor that contains
8 bytes in either the bytes-from-index format or the physical
sector format. A length of zero indicates that no DList
follows; this is not an error.
Bytes 4–n The defect descriptors are described in Sections 3.4.4.4. on
page 43. A length of zero indicates that no DList follows;
this is not an error.
42 Medalist Pro 2160N/2160WC Product Manual, Rev. A