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SCT Command Protocol
Command Transport
SCT Command Transport occurs when a 512-byte data packet (called “Key Sector”) is created and the written to
SMART or extended log page E0h. The key sector specifies Action and Function Codes along with the parameters
that are required to perform the action.
Issue SCT Command Using SMART
Command Block Output Registers
Register
7 6 5 4 3 2 1 0
Feature
D6h
Sector Count
01h
Sector Number
E0h
Cylinder Low
4Fh
Cylinder High
C2h
Device/Head
-
-
- D -
-
-
-
Command
B0h
Table 47 Output Registers of SCT Command Using SMART
Command Block Input Registers (Success)
Command Block Input Registers (Error)
Register
7 6 5 4 3 2 1 0 Register
7 6 5 4 3 2 1 0
Error
00h
Error
04h
Sector Count
Depends on command
Sector Count
Extended Status code
(LSB)
(LSB)
Sector Number
Depends on command
Sector Number
Extended Status code
(MSB)
(MSB)
Cylinder Low
Number of sectors to
Cylinder Low
Number of sectors to
transfer (LSB)
transfer (LSB)
Cylinder High
Number of sectors to
Cylinder High
Number of sectors to
transfer (MSB)
transfer (MSB)
Device/Head
-
-
-
-
-
-
-
- Device/Head
-
-
-
-
-
-
-
-
Status
50h
Status
51h
Table 48 Input Registers of SCT Command Using SMART
92
Western Digital Ultrastar DC HC310 SATA Product Manual