{"id":"external-drives.first-aid-cant-repair-my-external-drive","url":"/faq/external-drives/first-aid-cant-repair-my-external-drive","category":{"id":"external-drives","title":"External drives"},"subcategory":{"id":"drive-problems","title":"Mounting and drive problems"},"question":"What should I do if First Aid can't repair my external drive?","alt_questions":["First Aid failed external drive","Disk Utility couldn't repair disk","First Aid process has failed Mac external","External drive can't be repaired what now?","fsck failed external disk mac"],"short_answer":"Copy everything you need off the drive while it still mounts, stop writing to it, then erase it and run First Aid again. If errors return on a freshly erased drive, the hardware is likely failing and should be replaced.","answer_markdown":"Treat the drive as untrustworthy: copy everything you need off it now, while it still mounts, then erase it and test it before trusting it again. A file system that First Aid can't repair can lose more data the longer you keep writing to it.\n\nSteps:\n\n1. **Don't write anything new to the drive.** Close apps using it.\n2. Copy your important files to another drive. If the drive is read-only after the failure, copying off it still works.\n3. Erase the drive in Disk Utility (select the top-level device, **Erase**, APFS), then run First Aid again.\n4. If errors return on a freshly erased drive, the hardware is likely failing — replace it.\n\nIf the drive held things Storage Studio moved, see [what to do when your fast drive is failing](/faq/external-drives/my-fast-drive-is-failing-what-should-i-do) before erasing anything, so you bring those items back first.","answer_html":"

Treat the drive as untrustworthy: copy everything you need off it now, while it still mounts, then erase it and test it before trusting it again. A file system that First Aid can't repair can lose more data the longer you keep writing to it.

\n

Steps:

\n
  1. Don't write anything new to the drive. Close apps using it.
  2. Copy your important files to another drive. If the drive is read-only after the failure, copying off it still works.
  3. Erase the drive in Disk Utility (select the top-level device, Erase, APFS), then run First Aid again.
  4. If errors return on a freshly erased drive, the hardware is likely failing — replace it.
\n

If the drive held things Storage Studio moved, see what to do when your fast drive is failing before erasing anything, so you bring those items back first.

","answer_text":"Treat the drive as untrustworthy: copy everything you need off it now, while it still mounts, then erase it and test it before trusting it again. A file system that First Aid can't repair can lose more data the longer you keep writing to it.\n\nSteps:\n\n1. Don't write anything new to the drive. Close apps using it.\n2. Copy your important files to another drive. If the drive is read-only after the failure, copying off it still works.\n3. Erase the drive in Disk Utility (select the top-level device, Erase, APFS), then run First Aid again.\n4. If errors return on a freshly erased drive, the hardware is likely failing — replace it.\n\nIf the drive held things Storage Studio moved, see what to do when your fast drive is failing before erasing anything, so you bring those items back first.","tags":["first aid","repair","data recovery"],"related":[{"id":"external-drives.how-do-i-run-first-aid-on-an-external-drive","question":"How do I run First Aid on an external drive in Disk Utility?","url":"/faq/external-drives/how-do-i-run-first-aid-on-an-external-drive"},{"id":"external-drives.my-fast-drive-is-failing-what-should-i-do","question":"My fast drive seems to be failing — what should I do?","url":"/faq/external-drives/my-fast-drive-is-failing-what-should-i-do"},{"id":"external-drives.how-do-i-make-a-backup-of-my-fast-drive","question":"How do I back up my fast drive to another drive?","url":"/faq/external-drives/how-do-i-make-a-backup-of-my-fast-drive"}],"applies_to":"all","last_reviewed":"2026-10-01","title":"What should I do if First Aid can't repair my external drive? — Storage Studio FAQ","description":"Copy everything you need off the drive while it still mounts, stop writing to it, then erase it and run First Aid again. If errors return on a freshly erased drive, the hardware is likely failing and should be replaced.","crumbs":[{"name":"Home","path":"/"},{"name":"FAQ","path":"/faq/"},{"name":"External drives","path":"/faq/external-drives/"},{"name":"What should I do if First Aid can't repair my external drive?","path":"/faq/external-drives/first-aid-cant-repair-my-external-drive"}],"jsonld":{"@context":"https://schema.org","@type":"FAQPage","url":"https://storagestudio.us/faq/external-drives/first-aid-cant-repair-my-external-drive","inLanguage":"en","dateModified":"2026-10-01","mainEntity":[{"@type":"Question","name":"What should I do if First Aid can't repair my external drive?","alternateName":["First Aid failed external drive","Disk Utility couldn't repair disk","First Aid process has failed Mac external","External drive can't be repaired what now?","fsck failed external disk mac"],"acceptedAnswer":{"@type":"Answer","text":"Treat the drive as untrustworthy: copy everything you need off it now, while it still mounts, then erase it and test it before trusting it again. A file system that First Aid can't repair can lose more data the longer you keep writing to it.\n\nSteps:\n\n1. Don't write anything new to the drive. Close apps using it.\n2. Copy your important files to another drive. If the drive is read-only after the failure, copying off it still works.\n3. Erase the drive in Disk Utility (select the top-level device, Erase, APFS), then run First Aid again.\n4. If errors return on a freshly erased drive, the hardware is likely failing — replace it.\n\nIf the drive held things Storage Studio moved, see what to do when your fast drive is failing before erasing anything, so you bring those items back first.","url":"https://storagestudio.us/faq/external-drives/first-aid-cant-repair-my-external-drive"}}]},"fragment":"
\n
\n\n\n\n\n
\n
\n

External drives · Mounting and drive problems

\n

What should I do if First Aid can't repair my external drive?

\n

Short answer: Copy everything you need off the drive while it still mounts, stop writing to it, then erase it and run First Aid again. If errors return on a freshly erased drive, the hardware is likely failing and should be replaced.

\n

Treat the drive as untrustworthy: copy everything you need off it now, while it still mounts, then erase it and test it before trusting it again. A file system that First Aid can't repair can lose more data the longer you keep writing to it.

\n

Steps:

\n
  1. Don't write anything new to the drive. Close apps using it.
  2. Copy your important files to another drive. If the drive is read-only after the failure, copying off it still works.
  3. Erase the drive in Disk Utility (select the top-level device, Erase, APFS), then run First Aid again.
  4. If errors return on a freshly erased drive, the hardware is likely failing — replace it.
\n

If the drive held things Storage Studio moved, see what to do when your fast drive is failing before erasing anything, so you bring those items back first.

\n\n

Last reviewed

\n\n

Related questions

\n

Also available as Markdown and JSON.

\n
"}