My external hard drive suddenly stopped showing up in Finder on my Mac, but it contains important files I need. Disk Utility isn’t mounting it either. How can I safely recover the data without formatting or erasing the drive?
Do not erase, initialize, repartition, or keep repeatedly reconnecting the drive if it clicks, beeps, or disconnects by itself. Those symptoms can indicate hardware failure, and repeated attempts may make recovery harder.
First, try a different cable, USB port, and powered enclosure or adapter. Then check whether macOS can see the physical device with diskutil list in Terminal. If it appears there but won’t mount, recover or clone it before running First Aid, since repair tools write changes to the damaged file system. You can use Disk Drill for Mac to scan the physical disk or a byte-for-byte image. Recover files to a separate healthy drive, never back onto the problem drive.
If the disk does not appear in diskutil list or System Information even after changing the cable and enclosure, recovery software cannot access it. At that point, a professional recovery lab is the safer option, especially if the files are irreplaceable. Avoid opening the drive yourself or putting it in a freezer.
3 Likes
Don’t click “Initialize” if macOS says the disk is unreadable. If the drive appears in diskutil list, check whether it’s an encrypted APFS volume that simply needs unlocking with diskutil apfs list and diskutil apfs unlockVolume diskXsY. A recovery app cannot bypass a missing encryption password, so confirm that before spending hours scanning. If it isn’t locked and remains stable, follow @byteguru’s advice and recover to another disk rather than attempting repairs first.
A long recovery scan can be the thing that finishes off a failing drive. First swap the cable, port, and power supply, or test the bare drive in another compatible enclosure, since the enclosure may be the actual failure. If the disk clicks, disconnects, or freezes the Mac, stop testing and use a recovery service. If it stays stable, make a byte-for-byte image first, then scan that image with Disk Drill for Mac and restore files to a different drive. Avoid First Aid for now because repair attempts can alter damaged file-system data.
Before spending a cent, figure out whether the drive died or the enclosure did. Those are two completely different problems and people keep lumping them together. A dead USB bridge or a failing wall adapter looks exactly like a dead drive from Finder, and swapping the bare mechanism into another enclosure or a straight SATA-to-USB dock sorts that out in minutes. @datahacker8984 already flagged this, and honestly it’s the step most people skip because they assume the disk itself is toast.
The bit I’d push back on slightly is how casually ‘use a recovery lab’ gets thrown around. It’s the right call for a clicking or grinding drive, no argument. But labs quote based on the failure type, and a full mechanical job with a clean room isn’t a small charge. If your files are irreplaceable, fine. If it’s a backup of stuff you can rebuild, get the quote before you emotionally commit, because sometimes the recovery costs more than the data is worth to you.
For a drive that shows up in diskutil list and stays stable, the imaging advice above is solid. One thing that trips beginners up: Disk Drill lets you run the scan and preview what it can find for free, but pulling the files back out is behind the paid version. So you can confirm your data is actually recoverable before paying, which is a fair way to test the water. Just don’t let a long scan run on a drive that’s throwing errors, same warning as before.
The detail nobody mentioned yet is checking System Information under USB or Thunderbolt rather than only relying on Disk Utility. A drive can register there at the hardware level even when its file system is too scrambled to mount. If it’s not in System Information after you’ve tried a different enclosure, the electronics or the heads are gone and no software touches it. That’s your clean line between ‘software might work’ and ‘this is a hardware job.’