Samsung MZMPC128HBFU-00000 Manuale Utente

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        datasheet

This subcommand is used to communicate the reliability status of the device to the host's request. Upon receipt of the S.M.A.R.T. Return Status subcom-
mand the device asserts BSY, saves any updated Attribute Values to the reserved sector, and compares the updated Attribute Values to the Attribute 
Thresholds. 

If the device does not detect a Threshold Exceeded Condition, or detects a Threshold Exceeded Condition but involving attributes are advisory, the device 
loads 4Fh into the LBA Mid register, C2h into the LBA High register, clears BSY, and asserts INTRQ.

If the device detects a Threshold Exceeded Condition for prefailure attributes, the device loads F4h into the LBA Mid register, 2Ch into the LBA High reg-
ister, clears BSY, and asserts INTRQ. Advisory attributes never result in a negative reliability condition.

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 real-
location 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 collec-
tion feature to be disabled. Disabling this feature does not preclude the device from saving attribute values to nonvolatile memory during some other nor-
mal 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 collec-
tion 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 Auto-
matic Off-Line Data Collection and Off-line Read Scanning status. However, the device may respond with the error code specified in Table 7-9: 
“S.M.A.R.T. Error Codes” on page 30.