That should prompt you to repair the errors. Now run the filesystem check: fsck_apfs DEVICE_HERE.
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and of course SSDs are faster, which is why Backblaze has about half their drives SSDs instead of HDDs). SSDs and HDDs have about the same failure rate as well (mind you, in a harsh laptop environment with bumps/etc, HDDs are a lot worse. There aren't really good or bad suppliers either - they're all pretty much the same. Some fail the first day, most never fail - they're eventually just upgraded to a modern/faster drive. Backblaze says about 1% of their drives (they have millions) fail every year.
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(* drive is soldered on, and re-soldering a new one on risks other failures because of the heat stress it applies to the motherboard, so what Apple will actually do is scrap your Mac for spare parts/recycling and give you a new or refurbished one with a brand new battery and outer aluminium enclosure)įinally - not all failures are bad sectors. That's one of their early troubleshooting checks.
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When it can't, your only option is to recover from a backup or wipe the drive and re-install.Īpple will not replace the drive* unless it still fails to function after you have done a full erase and re-install. It's just that normally the drive can recover the data. Other sectors might go bad within minutes of the customer first turning it on.įailures are a lot more common than you might think. A 512GB SSD might actually be a 1TB SSD with too many bad sectors. Often they're found and set aside during initial quality control testing during manufacturing.
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There's no way to know other than compare it to a copy of the data that you know is accurate.Ī bad sector can happen at any time. But sometimes the data cannot be recovered. When a sector goes bad, the drive will try to recover the data and copy it to the replacement sector. but it reached a point where they didn't have enough space a basic computer just used for emails and web browsing. The drive was still working perfectly and they never lost any data. I once saw an a very old (12 years?) 512GB HDD with only 30GB of total storage space before the owner asked me to fix it. That means you might have several hundred gigabytes of storage go bad before the drive actually "fails".īy the way, in my experience it doesn't actually fail. When an SSD manufacturer estimates the life of the drive - they're talking about how many spare sectors have been set aside to be swapped into use when a sector fails, combined with an estimate of how many sectors will go bad over time under normal use (which varies depending on type of SSD).ĭepending on the type of drive, there could be as much as 30% of the total storage space dedicated to spares.