Seagate ST3400832NS, ST3250823NS manual 3 S.M.A.R.T. commands, 3.1 S.M.A.R.T. Command Transport SCT

4.3.3S.M.A.R.T. commands

S.M.A.R.T. provides near-term failure prediction for disc drives. When S.M.A.R.T. is enabled, the drive moni- tors predetermined drive attributes that are susceptible to degradation over time. If self-monitoring determines that a failure is likely, S.M.A.R.T. makes a status report available to the host. Not all failures are predictable. S.M.A.R.T. predictability is limited to the attributes the drive can monitor. For more information on S.M.A.R.T. commands and implementation, see the Draft ATA-5 Standard.

SeaTools diagnostic software activates a built-in drive self-test (DST S.M.A.R.T. command for D4H) that elimi- nates unnecessary drive returns. The diagnostic software ships with all new drives and is also available at: http://seatools.seagate.com.

You must have a recent BIOS or software package that supports S.M.A.R.T. to use this S.M.A.R.T. commands. The table below shows the S.M.A.R.T. command codes that the drive uses.

Table 8:	S.M.A.R.T. commands
Code in features register		S.M.A.R.T. command
D0H		S.M.A.R.T. Read Data
D2H		S.M.A.R.T. Enable/Disable Attribute Autosave
D3H		S.M.A.R.T. Save Attribute Values
D4H		S.M.A.R.T. Execute Off-line Immediate (runs DST)
D5H		S.M.A.R.T. Read Log Sector
D6H		S.M.A.R.T. Write Log Sector
D8H		S.M.A.R.T. Enable Operations
D9H		S.M.A.R.T. Disable Operations
DAH		S.M.A.R.T. Return Status

Note. If an appropriate code is not written to the Features Register, the command is aborted and 0x04 (abort) is written to the Error register.

4.3.3.1S.M.A.R.T. Command Transport (SCT)

NL35 Series Serial ATA drives implement SCT technologies to enable the drive to perform in a nearline storage environment.

The command transport uses log sectors to pass-through commands, to inquire about status, and to control data flow. For detailed information about SCT, refer to the T13 working draft 1701DT-N, Rev. 5 (or later). T13 working draft publications are available in PDF form at the following URL:

http://www.t13.org/docs2005/DT1701r5-SCT.pdf

Or, for the latest list of downloadable working drafts, go to the following URL and download the latest revision:

http://www.t13.org/docs2005/

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