7 S.M.A.R.T. Functionality
The SSD supports the following SMART commands, determined by the Feature Register value.
Table 58: S.M.A.R.T. Features Supported
Feature
D0h
D1h
D2h
D3h
D4h
D8h
D9h
DAh
Operation
SMART Read Data
SMART Read Attribute Thresholds
SMART Enable/Disable Autosave
SMART Save Attribute Values
SMART Execute OFF-LINE Immediate
SMART Enable Operations
SMART Disable Operations
SMART Return Status
SMART commands with Feature Register values not mentioned in the above table are not supported, and will be
aborted.
7.1 S.M.A.R.T. Enable / Disable operations
This command enables / disables access to the SMART capabilities of the SSD.
The state of SMART (enabled or disabled) is preserved across power cycles.
Table 59: S.M.A.R.T. Enable / Disable operations (Feature D8h / D9h)
Task File Register
7
6
5
4
3
2
1
0
COMMAND
B0h
DRIVE/HEAD
1
1
1
D
nu
CYLINDER HI
CYLINDER LOW
SECTOR NUM
SECTOR COUNT
FEATURES
C2h
4Fh
nu
nu
D8h / D9h
7.2 S.M.A.R.T. Return Status
This command checks the device reliability status. If the number of available spare blocks drops below an
internal threshold, the device will set the Cylinder Low register to F4h and the Cylinder High register to 2Ch. If no
threshold exceeded condition exists, the device will set the Cylinder Low register to 4Fh and the Cylinder High
register to C2h.
Table 60: S.M.A.R.T. return status (Feature DAh)
Task File Register
7
6
5
4
3
2
1
0
COMMAND
B0h
DRIVE/HEAD
1
1
1
D
nu
CYLINDER HI
CYLINDER LOW
SECTOR NUM
SECTOR COUNT
FEATURES
C2h
4Fh
nu
nu
DAh
Swissbit AG
Industriestrasse 4-8
Swissbit reserves the right to change products or specifications without notice.
Revision: 1.10
CH-9552 Bronschhofen
Switzerland
X-200m_data_sheet_SA-UxBR_Rev110.doc
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