My external hard drive suddenly stopped showing up in Finder and Disk Utility on my Mac. It contains important files I haven’t backed up, so I need help safely recovering the data without formatting or erasing the drive.
If the drive does not appear in Disk Utility even after choosing View > Show All Devices, treat this as a connection or hardware problem first. Recovery software cannot scan a disk that macOS cannot detect. Do not format it, initialize it, repartition it, or keep reconnecting it if you hear clicking, repeated spin-ups, or beeping.
Start with the low-risk checks: shut down the Mac, reconnect the drive with a different known-good cable, try another port, and remove any unpowered hub or questionable adapter. If it is a desktop drive, confirm that its power supply is working. Then check System Information under USB or Thunderbolt, depending on the connection. You can also open Terminal and run:
diskutil list
If the drive appears there but has no mounted volume, leave it unmodified for now. First Aid is often suggested immediately, but it can change filesystem metadata. With irreplaceable files, making a byte-for-byte image or clone before attempting repairs is safer.
Once macOS can see the physical disk, you can scan it with Disk Drill for Mac or another recovery tool. Save recovered files to a separate drive, never back onto the damaged one. If possible, scan an image of the drive rather than the original. Be aware that encryption may require the correct password or recovery key before usable files can be recovered.
If the disk is missing from System Information and diskutil list on multiple cables and computers, software is unlikely to help. The failure may be in the USB enclosure, its controller board, or the drive itself. A replaceable enclosure can sometimes be the issue, but opening a sealed portable drive or repeatedly powering up a clicking disk can make recovery harder. For data that cannot be replaced, stop there and use a professional recovery lab rather than experimenting with repairs.
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The missing detail is whether the drive has removable media inside a separate enclosure. If so, testing a compatible powered enclosure can rule out a failed USB bridge, but don’t open the drive itself or try this if it clicks or repeatedly spins down.
The key detail is whether the drive appears under System Information > USB or Thunderbolt. If it’s absent there, Disk Drill or any other recovery app cannot access it, so try another cable, port, powered hub, or Mac before scanning. If it does appear, stop reconnecting it repeatedly and recover files to a different drive, never back onto the failing one. @smartwizard4962’s enclosure suggestion makes sense for a removable SATA drive, but clicking, beeping, or constant spin-up failures are reasons to stop and use a professional recovery service.
A drive that goes silent and stays cold is a very different animal from one that spins up, clicks, and drops off after ten seconds. The first is often a dead bridge board or power issue, annoying but usually survivable. The second is a mechanical problem, and every extra power cycle spends a little more of the drive’s remaining life. People lump both under ‘not showing up’ and then apply the same steps, which is where recovery attempts go sideways.
The advice from @asynccoder about checking System Information before touching any software is the right order, and I’d stick to it. Recovery apps only matter once macOS actually sees the physical device. Where I’d push back a little is the amount of trial and error being suggested. Trying another cable, another port, another Mac, a powered hub, plus an enclosure swap sounds harmless on paper, but each attempt means another spin-up. On a drive that’s already faltering, that adds up fast. I’d cap it: two or three clean attempts, and if the disk still never appears, I stop.
The thing most people underestimate is cost, not effort. A professional lab quote for a clicking drive can run into the hundreds, sometimes higher for anything needing a clean-room head swap. That surprises folks who assumed recovery was a $90 software purchase. So before you send it off, be honest about how much the files are actually worth to you. If they’re irreplaceable, the price is the price. If they’re merely inconvenient to lose, the math changes.
On the software side, Disk Drill is fine for the logical case, meaning the disk shows up in diskutil list but won’t mount, and it’s genuinely healthy underneath. Point it at a byte-for-byte image if you can make one, not the original. But no scanner on earth reaches a disk the OS can’t detect, so if you’re at that stage, downloading recovery tools is just wasted time.
Short version of my take: let the sound and the detection tell you which problem you have, limit your reconnection attempts, and decide the money question early instead of after a lab already has the drive on the bench.