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Apple Computing Products:
macOS - Desktop Hardware
Looking for a good disk surface scan & repair
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<blockquote data-quote="ShanghaiTimes" data-source="post: 1637085" data-attributes="member: 341127"><p>Disk Keeper sorts out files and directory structures, but it can't repair bad sectors. or bad blocks. i.e., getting a few read errors on the Mini, and would like to do some sort of scan and repair. If possible.</p><p></p><p>in order to "repair" a bad sector, the data on the bad sector has to be moved out of the way, and then written back to disk. That process allows th OS to map out the bad spot so it doesn't get used again.</p><p>One way of doing this is for example, with a file called "unfortunate.log" that may be straddling a bad spot, then it needs to be deleted, the trash can emptied, then a new copy restored from the backup. As it's being written back to disk, the OS sees the bad sectors and maps them out of harms way.</p><p></p><p>Which is why </p><p>Booting from Recovery</p><p>Formatting working drive</p><p>Restoring from Time Machine will effectively map out any (new) bad sectors.</p><p></p><p>Except in the case of the bad sector being in the boot/recovery partition. Then you have a problem.</p><p></p><p>I think that's how it works</p></blockquote><p></p>
[QUOTE="ShanghaiTimes, post: 1637085, member: 341127"] Disk Keeper sorts out files and directory structures, but it can't repair bad sectors. or bad blocks. i.e., getting a few read errors on the Mini, and would like to do some sort of scan and repair. If possible. in order to "repair" a bad sector, the data on the bad sector has to be moved out of the way, and then written back to disk. That process allows th OS to map out the bad spot so it doesn't get used again. One way of doing this is for example, with a file called "unfortunate.log" that may be straddling a bad spot, then it needs to be deleted, the trash can emptied, then a new copy restored from the backup. As it's being written back to disk, the OS sees the bad sectors and maps them out of harms way. Which is why Booting from Recovery Formatting working drive Restoring from Time Machine will effectively map out any (new) bad sectors. Except in the case of the bad sector being in the boot/recovery partition. Then you have a problem. I think that's how it works [/QUOTE]
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Apple Computing Products:
macOS - Desktop Hardware
Looking for a good disk surface scan & repair
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