Technical information

HGST Ultrastar C15K600 Hard Disk Drive Specification
210
18.20
READ (32) - (7F/09)
Table 177 READ (32) - (7F/09)
Byte
Bit
7
6
5
4
3
2
1
0
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 = 0009h
10
RDPROTECT
DPO
FUA
RSVD=0
FUA_NV
RSVD=0
11
Reserved = 0
12 -19
(MSB)
Logical Block Address
(LSB)
20 - 23
(MSB)
Expected Initial Logical Block Reference Tag
(LSB)
24 - 25
(MSB)
Logical Block Application Tag
(LSB)
26-27
(MSB)
Logical Block Application Tag Mask
(LSB)
28 - 31
(MSB)
Transfer Length
(LSB)
The READ command requests that the drive transfer data from disk to the initiator. Each logical block transferred
includes user data and may include protection information, based on the RDPROTECT field and the drive format.
If the drive is formatted with type 2 protection (PROT_EN=1 and P_TYPE=001b in the READ CAPACITY (16)
parameter data), then this command will be processed normally. Any other protection types will result in Check
Condition status to be returned with sense key of Illegal Request and additional sense code of Invalid Command
Operation Code
The Expected Initial Logical Block Reference Tag field contains the value of the Logical Block Reference Tag field
expected in the protection information of the first logical block accessed by the command.
If the ATO bit is set to one in Mode Page 0Ah, the Logical Block Application Tag Mask field contains a value that is a
bit mask for enabling the checking of the Logical Block Application Tag field in the protection information for each
logical block accessed by the command. A Logical Block Application Tag Mask bit set to one enables the checking of