Seagate Medalist 2160N (ST52160N), Product Manual

Page: 78 / 138

3.6.6 Verify command (2F
H
)
When the drive receives the Verify command, it verifies the data on the
disc. If the host adapter supports disconnection, the drive disconnects
while it is executing this command.
Bytes
Bits
7 6 5 4 3 2 1 0
0 0 0 1 0 1 1 1 1
1 LUN 0 0 0
Byt
Chk
0
2–5 Logical block address
6 0 0 0 0 0 0 0 0
7–8 Verification Length
9 0 0 0 0 0 0 0 0
Byte 1 If the byte check (BytChk) bit is 0, the drive verifies the
media by checking the ECC syndromes. If the BytChk bit is
1, the drive verifies the media by performing a byte-by-byte
comparison of the data sent from the initiator.
Bytes 2–5 The logical block address field specifies the logical block
where the drive begins verifying the data.
Bytes 7–8 The verification length field specifies the number of contigu-
ous logical blocks to be verified. If the verification length is
0, the drive does not verify any logical blocks, although an
implied seek is still performed. This condition is not consid-
ered an error.
3.6.7 Read Defect Data command (37
H
)
When the drive receives this command, it reads the defect data and
transfers the defect data to the initiator.
This command can be used in conjunction with the Format Unit com-
mand. Read Defect Data reads the defect lists off the buffer memory and
resends the lists as defect data but does not change the lists.
The Read Defect Data command can be used to access two types of
defect lists: the
primary defect list (PList) and the grown defect list (GList).
These lists are described in Section 3.4.4.1. on page 40.
68 Medalist Pro 2160N/2160WC Product Manual, Rev. A