Table 51 Key Sector Format; Table 52 Sct Action Code List - Western Digital Ultrastar DC HC310 Specifications

9.18.2.1.3 Key Sector Format
An SCT command (Key Sector) is always 512 bytes long. Table below shows the generic format of an SCT
command.
Byte Field
1:0 Action Code
3:2 Function Code
X:4 Parameter1
Y:x+1 Parameter2
... ...
Total Words

Table 51 Key Sector Format

The action codes are defined in Table below.
Action Code Block Data
0000h -
0001h Read/Write
0002h Write
0003h -
0004h -
0005h Read
0006h-BFFFh -
C000h-FFFFh -

Table 52 SCT Action Code List

Words
1
1
Depends on command
Depends on command
...
256
TF Data Description
- Reserved
Y Long Sector Access (Not Supported)
N SCT Write Same
Y Error Recovery Control
Y Features Control
N SCT Data Table
- Reserved
- Vendor Specific
Western Digital Hard Disk Drive OEM Specification
Description
This field defines the command type and generally
specifies the type of data being accessed, such as sector
or physical action being performed, such as seek.
This field specifies the type of access, and varies by
command. For example, this can specify read, write,
verify, etc.
Depends on command
Depends on command
...
79