Operation Code; Table 4.3 Standard Command Descriptor Block For 12-Byte Commands; Table 4.4 Operation Code - Hitachi Ultrastar 15K73 Reference Manual

Table 4 3 Standard Command Descriptor Block for 12-byte Commands
Byte
0
1 Logical Unit Number
2
3
4
5
6
7
8
9
10
11

4.1.1 OPERATION CODE

Table 4.4 shows the format of the operation code.
Bit
Byte
0
The Operation Code consists of the group code and the command code.
4
7 5
Logical Block Address (MSB)
Logical Block Address (LSB)

Table 4.4 Operation Code

7 6 5
Group Code
4
Operation Code
Reserved
Logical Block Address
Logical Block Address
Transfer Length (MSB)
Transfer Length
Transfer Length
Transfer Length (LSB)
Reserved
Control Byte
4 3
Command Code
OEM MANUAL
2 1
RelAdr
2 1 0
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