T
T
T
S
S
S
6
6
6
0
0
0
G
G
G
S
S
S
S
S
S
D
D
D
2
2
2
5
5
5
D
D
D
-
-
-
M
M
M
T
T
T
S
S
S
1
1
1
2
2
2
0
0
0
G
G
G
S
S
S
S
S
S
D
D
D
2
2
2
5
5
5
D
D
D
-
-
-
M
M
M
2.5” Solid State Drive
Transcend Information Inc.
Preliminary V1.0
13
Selective self-test log structure
SMART Write Log Sector (subcommand D6h)
This command writes 512 bytes of data to the specified log sector. LBA Low and Sector Count registers shall be set to
specify the log address and sector number to be written.
SMART Enable Operations (subcommand D8h)
This subcommand enables access to all SMART capabilities. Prior to receipt of a SMART Enable Operations
subcommand, Attribute Values are neither monitored nor saved by the device. The state of SMART—either enabled or
disabled—will be preserved by the device across power cycles. Once enabled, the receipt of subsequent SMART
Enable Operations subcommands will not affect any of the Attribute Values.
SMART Disable Operations (subcommand D9h)
This subcommand disables all SMART capabilities. After receipt of this subcommand the device disables all SMART
operations. Non self-preserved Attribute Values will no longer be monitored. The state of SMART—either enabled or
disabled—is preserved by the device across power cycles. Note that this subcommand does not preclude the device's
power mode attribute auto saving.
After receipt of the SMART Disable Operations subcommand from the host, all other SMART subcommands except
SMART Enable Operations are disabled and will be aborted by the device returning the error code as specified in
“SMART Error Codes”.
Any Attribute Values accumulated and saved to volatile memory prior to receipt of the SMART Disable Operations
command will be preserved in the device's Attribute Data Sectors. If the device is re-enabled, these Attribute Values will
be updated, as needed, upon receipt of a SMART Read Attribute Values or a SMART Save Attribute Values command.
