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Comment Re:The measurements in question: (Score 1) 142

That's true. Writing to the sector will remap it. But if you get a bad sector, it's very rare for it to remain an isolated incident. And it may not be the sector, but rather the head that's actually failing. I usually consider the drive a likely loss by this point. After doing a full backup, I'll run the drive manufacturer's utility to scan the disk and remap sectors and then write zeroes to the drive for good measure. If all is OK after that, I can always clone my backup back onto the drive.

Comment Re:Windows app that displays these meaningfully? (Score 1) 142

On Linux, I just use smartmontools. Gives the same grid of data (mostly) as Crystal Disk Info. But when copying a failing drive, always use ddrescue. It will allow you to unplug the drive (to do some mysterious temporary fix like putting it back in the freezer) and plug it back in and restart from where you left off. Unless you only need a small amount of data (I prefer to just clone the entire system to a new drive to boot from).

Comment Re:The measurements in question: (Score 3, Informative) 142

Also, generally you don't need to panic over this attribute. You should panic when it increases steadily.

True, I've had a few drives hold steady at 1 sector reallocated. But if Current Pending Sector count remains non-zero for very long, it's a headache at the very least and probably a failure. Generally, it seems like as soon as you crest zero, it's over. I've had the next symptom be a totally unresponsive drive. But doing the backup when you hit 1 (admittedly overly cautious) will force the drive to read off all the sectors and you'll at least get your backup while you verify the rest of the drive still reads OK.

Comment Re:Windows app that displays these meaningfully? (Score 1) 142

A few of them aren't accounted for very well (and some of Samsung's stats are not accumulative stats). Crystal Disk Info makes it idiot-proof. If the square is blue, the drive is fine, yellow and the drive is probably failing soon, and red is a definite failure.

Raw value of zero is good. If Current Pending Sector Count or Reallocated Sector Count go above zero, you're likely dealing with a failing drive.

Most of the numbers are not important.

Comment Re:The measurements in question: (Score 4, Informative) 142

And I can confirm. Reallocated Sector Count rarely goes above zero when the drive is fine. It's possible to have a few sectors go bad and get reallocated, but it's usually part of a bigger problem when it happens (this number is reset to zero at the factory, after all initially bad sectors have been remapped). If the Current Pending Sector Count is non-zero, it's likely over.

I always clone a drive immediately with ddrescue when it gets to this point, while the drive is still working.

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