Seagate ST38421A Product Manual - Page 38

30 U4 Family Product Manual, Rev. D 55H Disable read look-ahead (read cache) feature. 82H Disable write cache. AAH Enable read look-ahead (read cache) feature (default). Note. At power-on, or after a hardware or software reset, the default values of the features are as indicated above. 3.2.4 S.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 monitors 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-4 Standard. This drive is shipped with S.M.A.R.T. features disabled. You must have a recent BIOS or software package that supports S.M.A.R.T. to enable this feature. The table below shows the S.M.A.R.T. command codes that the drive uses. Code in Features Register S.M.A.R.T. Command D0H D1H D2H D3H D4H D7H D8H D9H DAH S.M.A.R.T. Read Data Vendor-specific S.M.A.R.T. Enable/Disable Attribute Autosave S.M.A.R.T. Save Attribute Values S.M.A.R.T. Execute Off-line Immediate Vendor-specific S.M.A.R.T. Enable Operations S.M.A.R.T. Disable Operations 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.