My external hard drive suddenly stopped showing up in Finder on my Mac, but it contains important files I need to recover. Disk Utility does not seem to recognize it consistently. What can I do to access the drive without losing my data?
Repeatedly reconnecting it or running First Aid can make recovery harder if the drive is physically failing. Don’t initialize, erase, repartition, or copy anything onto it. If it clicks, spins down, or disconnects every few seconds, stop powering it up and consider a recovery lab.
First rule out the cheap stuff: try a different cable, port, powered hub or power adapter, and another Mac if available. Check System Information under USB or Thunderbolt. If the drive appears there but not in Finder, open Disk Utility, choose View > Show All Devices, and see whether the physical disk appears above the missing volume. Finder settings are worth checking too, but inconsistent detection in Disk Utility usually points to the cable, enclosure, or drive rather than a hidden Finder setting.
If macOS can detect the physical disk reliably, make a byte-for-byte image or clone to another healthy drive before scanning it. You can use Disk Drill for Mac to scan the drive or its disk image, but install the software and save recovered files somewhere else. No recovery app can help if the Mac cannot see the hardware at all, so testing the enclosure or using professional recovery is the safer next step in that case.
2 Likes
Treat any brief mount as borrowed time. Don’t open folders at random or let Photos, Spotlight, or Time Machine start poking around. Copy the smallest, most important files to a different drive first. If Finder hangs on one damaged file, skip it rather than repeatedly retrying.
The full-disk image suggested by @codecrafter is the better route when the hardware stays connected long enough. Before running recovery software, check Terminal with diskutil list. Sometimes Disk Utility’s interface fails to refresh even though macOS has assigned the device a disk number. If it appears there consistently but the volume will not mount, scan or image that device with Disk Drill for Mac and save everything elsewhere.
If the disk vanishes from diskutil list as well, software is no longer the useful layer. A replaceable SATA enclosure may have a bad USB bridge, but avoid opening sealed portable drives or swapping enclosures blindly since some models depend on the original bridge board for encryption. Clicking, repeated spin-ups, or disconnects are the point to stop and use a lab.
Skip the freezer trick and any ‘shake it to reseat the platter’ nonsense you’ll find on random sites. If the drive is actually dying, the byte-for-byte image everyone’s pointing at is the right call, but a plain clone isn’t ideal for a flaky disk. A normal copy chokes and retries on bad sectors, which is exactly the stress you don’t want. If macOS sees the physical disk but it keeps stumbling, ddgrescue (the gddrescue package via Homebrew) handles read errors far more gracefully than a straight dd or a standard clone, and it’s free. Grab the image with that first, then let Disk Drill or whatever scan the image instead of the live drive. And @darkspark5902 is right about the encryption thing, but I’d go further: if it’s a hardware-encrypted portable and the bridge board is dead, no amount of software helps, so don’t waste days on it before pricing a lab.