Hardware • [Software] Power off external SSD on shutdown

Hello,

According to a manufacturer [1], the "POR Recovery Count" is:

A count of the number of sudden power off cases. If there is a sudden power off, the firmware must recover all of the mapping and user data during the next power on. This is a count of the number of times this has happened.

According to a different manufacturer [2]:

Under a normal system shutdown, the SSD receives a command (Standby Immediate Command) from the host ATA driver alerting the SSD that the system is shutting down and the SSD prepares for power removal. In a normal system shutdown, the SSD has plenty of time to flush its cache buffers and update its mapping tables.

According to the hdparm manual page [3] this can be accomplished with the -y parameter:

[..]
-y Force an IDE drive to immediately enter the low power consumption standby mode, usually causing it to spin down. The current power mode status can be checked using the -C option.
[..]

This topic has been already discussed:

• SSD increase POR Recovery Count on OS reboot, but not on shutdown

Some questions:

1. What is the manufacturer and model of your SDD ?
2. Is the external SSD already shipped with the external enclosure ? Or are you using a third part enclosure ?
3. How do you shutdown the computer ?
4. Do you unmount the external SSD before shutting down the computer ?
5. Do you remove the external SSD without unmounting it ?

Hope this helps.

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[1] S.M.A.R.T. Self-Monitoring, Analysis and Reporting Technology
[2] A Closer Look At SSD Power Loss Protection
[3] HDPARM(8) System Manager's Manual

Statistics: Posted by Aki — 2024-07-30 16:52 — Replies 2 — Views 43

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