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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
Words
Description
1:0
Action Code
1
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.
3:2
Function Code
1
This field specifies the type of access, and varies by
command. For example, this can specify read, write,
verify, etc.
X:4
Parameter1
Depends on command
Depends on command
Y:x+1
Parameter2
Depends on command
Depends on command
…
…
…
…
Total Words
256
Table 51 Key Sector Format
The action codes are defined in Table 52 below.
Action Code
Block Data
TF Data
Description
0000h
-
-
Reserved
0001h
Read/Write
Y
Long Sector Access (Not Supported)
0002h
Write
N
SCT Write Same
0003h
-
Y
Error Recovery Control
0004h
-
Y
Features Control
0005h
Read
N
SCT Data Table
0006h-BFFFh
-
-
Reserved
C000h-FFFFh
-
-
Vendor Specific
Table 52 SCT Action Code List
94
Western Digital Ultrastar DC HC310 SATA Product Manual