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2.5” Solid State Drive
Transcend Information Inc.
Preliminary V1.02
This subcommand is used to communicate the reliability status of the device to the host's request. Upon receipt of the
SMART Return Status subcommand the device saves any updated Attribute Values to the reserved sector, and
compares the updated Attribute Values to the Attribute Thresholds.
SMART Enable/Disable Automatic Off-line (subcommand DBh)
This subcommand enables and disables the optional feature that cause the device to perform the set of off-line data
collection activities that automatically collect attribute data in an off-line mode and then save this data to the device's
nonvolatile memory. This subcommand may either cause the device to automatically initiate or resume performance of its
off-line data collection activities or cause the automatic off-line data collection feature to be disabled. This subcommand
also enables and disables the off-line read scanning feature that cause the device to perform the entire read scanning
with defect reallocation as the part of the off-line data collection activities. The Sector Count register shall be set to specify
the feature to be enabled or disabled:
Sector Count Feature Description
00h Disable Automatic Off-line
F8h Enable Automatic Off-line
A value of zero written by the host into the device's Sector Count register before issuing this subcommand shall cause the
automatic off-line data collection feature to be disabled. Disabling this feature does not preclude the device from saving
attribute values to nonvolatile memory during some other normal operation such as during a power-on, during a power-off
sequence, or during an error recovery sequence. A value of F8h written by the host into the device's Sector Count register
before issuing this subcommand shall cause the automatic Off-line data collection feature to be enabled. Any other
non-zero value written by the host into this register before issuing this subcommand is vendor specific and will not change
the current Automatic Off-Line Data Collection and Off-line Read Scanning status. However, the device may respond with
the error code specified in “SMART Error Codes”.
Security
SecuritySecurity
Security
Default setting
The Flash SSD is shipped with master password set to 20h value (ASCII blanks) and the lock function disabled. The
system manufacturer/dealer may set a new master password by using the SECURITY SET PASSWORD command,
without enabling the lock function.
Initial setting of the user password
When a user password is set, the drive automatically enters lock mode by the next powered-on.
SECURITY mode operation from power-on
In locked mode, the Flash SSD rejects media access commands until a SECURITY UNLOCK command is successfully
completed.
Password lost
If the user password is lost and High level security is set, the drive does not allow the user to access any data. However,
the drive can be unlocked using the master password.
If the user password is lost and Maximum security level is set, it is impossible to access data. However, the drive can be