Recovering an external hard drive on Mac covers two scenarios: getting the drive recognized and accessible again, and recovering the files from it when repair fails. This guide covers both.
Part 1. Check Disk Utility First
- Open Disk Utility → View → Show All Devices
- Check the left sidebar for the external drive
| Status in Disk Utility | Meaning | Next Step |
|---|---|---|
| Greyed out | Detected, not mounted | Click Mount |
| Shows First Aid option | File system errors | Run First Aid |
| Not visible at all | Not detected | Check cable/port |
| Shows as NTFS | Windows format | Install NTFS tool |
Part 2. Fix Common Mac External Drive Issues
Cable/port: Try a different cable and different Thunderbolt/USB-C port on the Mac.
NTFS drives (Windows-formatted): macOS can read NTFS but may not auto-mount. Install Paragon NTFS for Mac or Mounty.
First Aid: Select the drive in Disk Utility → First Aid → Run. Fixes most file system corruption without data loss.
NVRAM reset (Intel Mac): Option + Command + P + R at startup for 20 seconds. Resolves some hardware detection issues.
💡 Tip: Run First Aid on the physical disk entry (the parent entry above the volume) for the most thorough repair. Physical-level First Aid catches partition map errors that volume-level repair misses.
Part 3. Recover Files From an Inaccessible External Drive
If the drive is detected but won't mount or open after First Aid, recover files before attempting any format.
🗣️ r/mac user: "External WD drive stopped mounting on Mac after a power outage mid-write. First Aid couldn't fix it. Recovery software found all 800 GB of files and recovered everything to a new drive. Took 6 hours but got everything back."
🗣️ r/datarecovery guidance: "For external drives that won't mount on Mac, try First Aid first — it costs nothing and fixes most logical errors. If that fails, go straight to recovery software before any format attempt."
Part 4. Recover Files From External Drive With Ritridata
Ritridata recovers files from external drives that Mac can detect but not open — supporting NTFS, exFAT, HFS+, and APFS external drives on both Intel and Apple Silicon Macs.
Step 1 — Connect the external drive and select it from the list
Step 2 — Run a scan — reads sectors regardless of mount status
Step 3 — Recover files to your Mac's internal drive
FAQ
Why is my external hard drive not showing up on Mac? Most common causes: NTFS format (not auto-mounted by macOS), file system corruption (fix with First Aid), cable or adapter failure, or insufficient power for bus-powered drives.
Can I recover files from an external drive that Mac won't mount? Yes — if the drive is detected in Disk Utility even as greyed-out, recovery software can scan it at the sector level and extract files without needing to mount the volume.
Does reformatting an external drive for Mac destroy files? Standard Erase (quick format) leaves data in sectors — recovery is possible afterward. Secure Erase overwrites all sectors — data is gone. Always recover files before reformatting.