Deskstar T7K500 Hard Disk Drive Specification
105
10.18.0.1 Capability definition
Capability Identification is performed by issuing Identify Device command. Word 206 of Identify Data is used to
determine if SCT is enabled and which SCT Action Codes are supported.
10.18.0.2 SCT Command Nesting and intermingling with Standard commands
In general, standard ATA commands can be intermingled with SCT Commands but SCT commands cannot be
nested. SCT commands that do not require a follow-on data transfer operation never have an issue with being
intermixed with any ATA commands or each other. SCT commands that do require data transfer, on the other hand,
may not be nested; that is, if a key command that requires a data transfer is issued, all data transfer - to or from the
host - must complete before another SCT command is issued. In most cases, however, ATA read/write commands
may be inserted in between SCT data transfers, that is, between complete SMART Read Log/Write Log commands.
Furthermore, any reset (power-on, software or hardware) will cause the SCT command to be aborted.
10.18.0.3 Resets
In an SCT command is executing, any reset including Soft Reset, Hard Reset, COMRESET, and Power-On Reset
all cause the command to be terminated. This could result in partial command execution or data loss. There is no
indication once the drive becomes ready that the previous command was terminated.
10.18.1 SCT Command Protocol
Command Tansport
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.
10.18.1.1 Issue SCT Command Using SMART
Word Description
206 SCT Command set support
15-12 Vendor Specific
11-6 Reserved
5 Action Code 5 (SCT Data Table) supported
4 Action Code 4 (Features Control) supported
3 Action Code 2 (LBA Segment Access) supported
2 Action Code 2 (LBA Segment Access) supported
1 Action Code 1 (Long Sector Access) supported
0 SCT Feature Set supported (includes SCT status)
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 - - -
To Next Page
Loading...
Need help?
General