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11.8.42.9 SMART Disable Operations
COMMAND CODE
1 0 1 1 0 0 0 0
REGISTER
REGISTER SETTING NORMAL COMPLETION
DR DRIVE No. no change
CY C24Fh no change
HD no change
SN no change
SC no change
FT D9h no change
This command disables all SMART capabilities within the drive including any and all timer functions related
exclusively to this function. After receipt of this command the drive may disable all SMART operations.
Parameters for drive failure prediction will no longer be monitored or saved by the drive. The state of
SMART (either enabled or disabled) will be preserved by the drive across power cycles.
Upon receipt of the SMART DISABLE OPERATIONS command from the host, the drive sets BSY, disables
SMART capabilities and functions, clears BSY and asserts INTRQ.
After receipt of this command by the drive, all other SMART commands, except for SMART ENABLE
OPERATIONS, are disabled and invalid and will be aborted by the drive (including SMART DISABLE
OPERATIONS commands) with an Aborted command error.
11.8.42.10 SMART Return Status
COMMAND CODE
1 0 1 1 0 0 0 0
REGISTER
REGISTER SETTING NORMAL COMPLETION
DR DRIVE No. no change
CY C24Fh C24Fh/2CF4h
HD no change
SN no change
SC no change
FT DAh no change
If an impending failure is not predicted, the drive sets the Cylinder Low register to 4Fh and the Cylinder High
register to C2h. If an impending failure is predicted, the drive sets the Cylinder Low register to F4h and the
Cylinder High register to 2Ch.
This command is used to communicate the reliability status of the drive to the host’s request. Upon receipt of
this command the drive sets BSY, saves any parameters monitored by the drive to non-volatile memory and
checks the drive condition.