{"id":"external-drives.how-do-i-run-first-aid-on-an-external-drive","url":"/faq/external-drives/how-do-i-run-first-aid-on-an-external-drive","category":{"id":"external-drives","title":"External drives"},"subcategory":{"id":"checking-the-drive","title":"Checking your drive"},"question":"How do I run First Aid on an external drive in Disk Utility?","alt_questions":["Disk Utility First Aid external drive","Repair external drive Mac","How to fix a corrupted external drive on Mac","Run First Aid on USB drive","check and repair external SSD macOS","First Aid on container or volume?"],"short_answer":"Open Disk Utility, choose View → Show All Devices, select the drive's volume and click First Aid → Run. For a full check, run it on each volume, then the container, then the device. It repairs file-system errors, not failing hardware.","answer_markdown":"Open **Disk Utility**, choose **View → Show All Devices**, select the external drive's volume in the sidebar and click **First Aid**, then **Run**. First Aid checks the volume's structure and repairs the errors it can. Close apps using the drive first.\n\nFor the most thorough check, run First Aid in this order: each **volume** on the drive, then the **container** (on APFS drives), then the top-level **device**. Each level checks something different.\n\nWhat the result means:\n\n- **\"appears to be OK\"** — nothing to fix.\n- **Repaired** — run it once more to confirm it now passes.\n- **Couldn't repair** — copy anything important off the drive straight away, then consider erasing it. See [what to do if First Aid can't repair it](/faq/external-drives/first-aid-cant-repair-my-external-drive).\n\nFirst Aid checks the file system, not the hardware. A drive that keeps needing repair may be failing — see [checking a drive for errors or health problems](/faq/external-drives/how-do-i-check-an-external-drive-for-errors).","answer_html":"

Open Disk Utility, choose View → Show All Devices, select the external drive's volume in the sidebar and click First Aid, then Run. First Aid checks the volume's structure and repairs the errors it can. Close apps using the drive first.

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For the most thorough check, run First Aid in this order: each volume on the drive, then the container (on APFS drives), then the top-level device. Each level checks something different.

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What the result means:

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First Aid checks the file system, not the hardware. A drive that keeps needing repair may be failing — see checking a drive for errors or health problems.

","answer_text":"Open Disk Utility, choose View → Show All Devices, select the external drive's volume in the sidebar and click First Aid, then Run. First Aid checks the volume's structure and repairs the errors it can. Close apps using the drive first.\n\nFor the most thorough check, run First Aid in this order: each volume on the drive, then the container (on APFS drives), then the top-level device. Each level checks something different.\n\nWhat the result means:\n\n- \"appears to be OK\" — nothing to fix.\n- Repaired — run it once more to confirm it now passes.\n- Couldn't repair — copy anything important off the drive straight away, then consider erasing it. See what to do if First Aid can't repair it.\n\nFirst Aid checks the file system, not the hardware. A drive that keeps needing repair may be failing — see checking a drive for errors or health problems.","tags":["disk utility","first aid","repair"],"related":[{"id":"external-drives.how-do-i-check-an-external-drive-for-errors","question":"How do I check my external drive for errors or health problems?","url":"/faq/external-drives/how-do-i-check-an-external-drive-for-errors"},{"id":"external-drives.first-aid-cant-repair-my-external-drive","question":"What should I do if First Aid can't repair my external drive?","url":"/faq/external-drives/first-aid-cant-repair-my-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"}],"applies_to":"all","last_reviewed":"2026-10-01","title":"How do I run First Aid on an external drive in Disk Utility? — Storage Studio FAQ","description":"Open Disk Utility, choose View → Show All Devices, select the drive's volume and click First Aid → Run. For a full check, run it on each volume, then the container, then the device. It repairs file-system errors, not failing hardware.","crumbs":[{"name":"Home","path":"/"},{"name":"FAQ","path":"/faq/"},{"name":"External drives","path":"/faq/external-drives/"},{"name":"How do I run First Aid on an external drive in Disk Utility?","path":"/faq/external-drives/how-do-i-run-first-aid-on-an-external-drive"}],"jsonld":{"@context":"https://schema.org","@type":"FAQPage","url":"https://storagestudio.us/faq/external-drives/how-do-i-run-first-aid-on-an-external-drive","inLanguage":"en","dateModified":"2026-10-01","mainEntity":[{"@type":"Question","name":"How do I run First Aid on an external drive in Disk Utility?","alternateName":["Disk Utility First Aid external drive","Repair external drive Mac","How to fix a corrupted external drive on Mac","Run First Aid on USB drive","check and repair external SSD macOS","First Aid on container or volume?"],"acceptedAnswer":{"@type":"Answer","text":"Open Disk Utility, choose View → Show All Devices, select the external drive's volume in the sidebar and click First Aid, then Run. First Aid checks the volume's structure and repairs the errors it can. Close apps using the drive first.\n\nFor the most thorough check, run First Aid in this order: each volume on the drive, then the container (on APFS drives), then the top-level device. Each level checks something different.\n\nWhat the result means:\n\n- \"appears to be OK\" — nothing to fix.\n- Repaired — run it once more to confirm it now passes.\n- Couldn't repair — copy anything important off the drive straight away, then consider erasing it. See what to do if First Aid can't repair it.\n\nFirst Aid checks the file system, not the hardware. A drive that keeps needing repair may be failing — see checking a drive for errors or health problems.","url":"https://storagestudio.us/faq/external-drives/how-do-i-run-first-aid-on-an-external-drive"}}]},"fragment":"
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External drives · Checking your drive

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How do I run First Aid on an external drive in Disk Utility?

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Short answer: Open Disk Utility, choose View → Show All Devices, select the drive's volume and click First Aid → Run. For a full check, run it on each volume, then the container, then the device. It repairs file-system errors, not failing hardware.

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Open Disk Utility, choose View → Show All Devices, select the external drive's volume in the sidebar and click First Aid, then Run. First Aid checks the volume's structure and repairs the errors it can. Close apps using the drive first.

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For the most thorough check, run First Aid in this order: each volume on the drive, then the container (on APFS drives), then the top-level device. Each level checks something different.

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What the result means:

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  • "appears to be OK" — nothing to fix.
  • Repaired — run it once more to confirm it now passes.
  • Couldn't repair — copy anything important off the drive straight away, then consider erasing it. See what to do if First Aid can't repair it.
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First Aid checks the file system, not the hardware. A drive that keeps needing repair may be failing — see checking a drive for errors or health problems.

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Last reviewed

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