Samsung PM800 - 2.5" SATA 3.0Gb/s MLC SSD 256GB MMDOE56G5MXP-0VB 用户手册
产品代码
MMDOE56G5MXP-0VB
- 18 -
MMCRE64G5MXP-0VB
datasheet
SSD
Rev. 1.3
MMCRE28G5MXP-0VB
MMDOE56G5MXP-0VB
7.2 SECURITY FEATURE Set
The Security mode features allow the host to implement a securtity password system to prevent unauthorized access to the disk drive.
7.2.1 1 SECURITY mode default setting
The NSSD 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 enableing the lock func-
tion.
The system manufacturer/dealer may set a new master password by using the SECURITY SET PASSWORD command, without enableing the lock func-
tion.
7.2.2 1 Initial setting of the user password
When a user password is set, the drive automatically enters lock mode by the next powered-on
7.2.3 1 SECURITY mode operation from power-on
In locked mode, the NSSD rejects media access commands until a SECURITY UNLOCK command is successfully completed.
7.2.4 1 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.
However, the drive can be unlocked using the master password.
If the user password is lost and Maxium security level is set, it is impossible to access data.
However, the drive can be unlocked using the ERASE UNIT command with the master password. The drive will erase all user data and unlock the drive.
However, the drive can be unlocked using the ERASE UNIT command with the master password. The drive will erase all user data and unlock the drive.
7.3 SMART FEATURE Set (B0h)
The SMART Feature Set command provides access to the Attribute Values, the Attribute Thresholds, and other low level subcommands that can be used
for logging and reporting purposes and to accommodate special user needs. The SMART Feature Set command has several separate subcommands
which are selectable via the device's Features Register when the SMART Feature Set command is issued by the host. In order to select a subcommand
the host must write the subcommand code to the device's Features Register before issuing the SMART Feature Set command.
for logging and reporting purposes and to accommodate special user needs. The SMART Feature Set command has several separate subcommands
which are selectable via the device's Features Register when the SMART Feature Set command is issued by the host. In order to select a subcommand
the host must write the subcommand code to the device's Features Register before issuing the SMART Feature Set command.
7.3.1 1 Sub Command
In order to select a subcommand the host must write the subcommand code to the device's Features Register before issuing the S.M.A.R.T. Function Set
command. The subcommands and their respective codes are listed below.
command. The subcommands and their respective codes are listed below.
7.3.1.2 S.M.A.R.T. Read Attribute Values (subcommand D0h)
This subcommand returns the device's Attribute Values to the host. Upon receipt of the S.M.A.R.T. Read Attribute Values subcommand from the host, the
device asserts BSY, saves any updated Attribute Values to the Attribute Data sectors, asserts DRQ, clears BSY, asserts INTRQ, and then waits for the
host to transfer the 512 bytes of Attribute Value information from the device via the Data Register.
device asserts BSY, saves any updated Attribute Values to the Attribute Data sectors, asserts DRQ, clears BSY, asserts INTRQ, and then waits for the
host to transfer the 512 bytes of Attribute Value information from the device via the Data Register.
7.3.1.3 S.M.A.R.T. Read Attribute Thresholds (subcommand D1h)
This subcommand returns the device's Attribute Thresholds to the host. Upon receipt of the S.M.A.R.T. Read Attribute Thresholds subcommand from the
host, the device reads the Attribute Thresholds from the Attribute Threshold sectors and then waits for the host to transfer the 512 bytes of Attribute
Thresholds information from the device.
host, the device reads the Attribute Thresholds from the Attribute Threshold sectors and then waits for the host to transfer the 512 bytes of Attribute
Thresholds information from the device.
Subcommand
Code
Subcommand
Code
SMART READ DATA
D0h
SMART WRITE LOG
D6h
SMART READ ATTRIBUTE THRESHOLDS
D1h
SMART ENABLE OPERATIONS
D8h
SMART ENABLE/DISABLE ATTRIBUTE AUTOSAVE
D2h
SMART DISABLE OPERATIONS
D9h
SMART SAVE ATTRIBUTE VALUES
D3h
SMART RETURN STATUS
DAh
SMART EXECUTE OFF-LINE IMMIDIATE
D4h
SMART ENABLE/ DISABLE AUTOMATIC OFF-LINE
DBh
SMART READ LOG
D5h