Deskstar 7K160 Hard Disk Drive Specification
110
10.22.1.2 Issue SCT Command Using Write Log Ext
10.22.1.3 Key Sector Format
An SCT command (Key Sector) is always 512 bytes long. Table below shows the generic format of an SCT
command.
Command Block Output Registers
Register 7 6 5 4 3 2 1 0
Current Reserved Feature
Previous Reserved
Current 01h Sector Count
Previous 00h
Current E0h LBA Low
Previous Reserved
Current 00h LBA Mid
Previous 00h
Current Reserved LBA High
Previous Reserved
Device/Head - - - D - - - -
Command 3Fh
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
HOB=0
Depends on command
(LSB)
HOB=0
Extended Status Code
(LSB)
Sector
Count
HOB=1 Reserved
Sector
Count
HOB=1 Reserved
HOB=0
Depends on command
(MSB)
HOB=0
Extended Status Code
(MSB)
LBA Low
HOB=1 Reserved
LBA Low
HOB=1 Reserved
HOB=0
Number of sectors
(LSB)
HOB=0
Number of sectors
(LSB)
LBA Mid
HOB=1 Reserved
LBA Mid
HOB=1 Reserved
HOB=0
Number of sectors
(MSB)
HOB=0
Number of sectors
(MSB)
LBA High
HOB=1 Reserved
LBA High
HOB=1 Reserved
Device/Head - - - - - - - - Device/Head - - - - - - - -
Status 50h Status 51h
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