Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification
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19.63 WRITE SAME (32) - (7F/0D)Table 251:Write Same (32) - (7F/0D)
The WRITE SAME command requests that the drive write a single block of data transferred from the initiator to disk for a
number of sequential logical blocks. This command is useful for writing large data areas with the same data, without sending
all of the data over the interface. Each logical block transferred includes user data and may include protection information,
based on the WRPROTECT field and the drive format. Each logical block written includes user data and, if the drive is for-
matted with protection information enabled, protection information.
Byte Bit
76543210
0 Command Code = 7Fh
1 VU = 0 Reserved = 0 FLAG LINK
2-5 Reserved = 0
6 Reserved = 0 Group Number = 0
7 Additional CDB Length = 18h
8 - 9 Service Action = 000Dh
10 WRPROTECT Reserved = 0 PBDATA
=0 LBDATA
=0 Reserved
=0
11 Reserved = 0
12 - 19
(MSB)
Logical Block Address
(LSB)
20 - 23
(MSB)
Expected Initial Logical Block Reference Tag
(LSB)
24 - 25
(MSB)
Expected Logical Block Application Tag
(LSB)
26 - 27
(MSB)
Logical Block Application Tag Mask
(LSB)
28 - 31
(MSB)
Number of Blocks
(LSB)