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new Ubuntu user here.

"Disk is OK, 7 bad sectors (37° C/99° F)"

My laptop is 6 years old, fan was getting real noisy (I suspect it was because the laptop couldn't really handle the Windows 10 1806 update), so I switched to Ubuntu and it's gone mostly quiet. It's a 1TB HDD, never been touched, added to nor subtracted from, currently 6.3% full. The laptop is a Samsung and I suspect the HDD is a Samsung too.

1) Do most HDDs have zero bad sectors?

2) At how many bad sectors should I be looking to change my laptop/HDD? (I back up regularly, nothing really important on this laptop)

Thank you

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    7 bad sectors isn't bad... depending on WHERE they are, and IF they are causing the drive to do re-calibrates. If you don't notice a problem, then you're fine.
    – heynnema
    May 27 '18 at 22:42
  • Read this: Bad Sectors Explained - How-To Geek
    – wjandrea
    May 27 '18 at 22:44
  • As long as the SMART status is fine and the number of bad sectors is not significantly increasing, your disk is probably still rather safely usable for another while. Just make sure you regularly check back on the value every now and then and stay aware of the fact that the disk could possibly die some time (which is always the case, even for brand new disks)...
    – Byte Commander
    May 27 '18 at 23:00
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It is not that bad, but having even one bad sector is a warning sign that the part has entered the next failure stage, and more bad sectors can develop. It is just a matter of how soon. So, definitely don't rely on this system for important work/data you plan on preserving.

Also, the hdd does not require a fixed number of bad sectors to die suddenly (the chance of sudden death already increased significantly between zero to non-zero), so the usual recommended practice is to get a replacement for any hard disk with known bad sectors.

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