[PLUG] Recommended Disk Test

Dick Steffens dick at dicksteffens.com
Thu Jan 15 15:01:58 PST 2015

On 01/15/2015 12:42 PM, Brian Martin wrote:
>> sudo smartctl -a /dev/sda
> As mentioned by others, your disk is 4.2 years old (Power_On_Hours / 24
> / 365), so it's beyond the planned lifespan of 3  years -- though most
> disks exceed that.  You can safely do the following:
>       - "sudo smartctl -t offline /dev/sda"
>       - wait the named amount of time +50%, because their estimates are
> always optimistic
Sending command: "Execute SMART off-line routine immediately in off-line 
Drive command "Execute SMART off-line routine immediately in off-line 
mode" successful.
Testing has begun.
Please wait 625 seconds for test to complete.
Test will complete after Thu Jan 15 15:07:29 2015

I'll come back to it after 3:30 and run the next part.

>       - "sudo smartctl -l selftest /dev/sda"
> You should see an entry under extended tests with a LifeTime hours that
> matches the current value of Power_On_Hours.  It'll report whether it
> detected errors or not.  This test is non-destructive, can be run
> on-line (despite the "offline" name -- probably a historical artifact),
> but is only somewhat effective in detecting problems.
> I've used lots of other test from the various manufacturers (see my
> article at http://www.pdxsys.com/articles/hard-drive-test-tools/ for
> info), but these are destructive and the best one was only 75% effective
> at detecting a known failed drive

Thanks. I've got a new power supply on order. Should arrive Monday.

I'll keep in mind that this  hard drive is old, and should be replaced, 


Dick Steffens

More information about the PLUG mailing list