My USB drive suddenly stopped showing up properly on my Mac after I unplugged it without ejecting, and now I can’t access important files I need for work. I’m looking for help with USB drive recovery on Mac, including how to repair the drive, recover lost data, and see if the files can still be saved.
I thought I was about to email my professor and say I nuked my project off a USB stick. No joke. I kept all my files on it, ejected it properly, plugged it into a friend’s MacBook to show one folder, and then a chunk of stuff was missing. Around 3 GB. The drive still mounted fine. The files were not in Trash. They were not sitting in some weird folder. They were gone.
I tried the first Finder check right away, cmd + shift + ., to show hidden files. Nothing. Put the drive back into my own Mac. Same result. At that point I was half convinced macOS had decided my semester needed more stress.
The thing that got me moving in the right direction was this post:
https://discussion.7datarecovery.com/forum/topic/deleted-files-from-usb-drive-on-mac-any-way-to-recover-them/
What helped me was the step-by-step recovery part. Disk Utility said the USB drive looked normal, which was useless because the files were still missing. I followed the recovery steps from that thread and managed to pull most of the data back. A few files came back damaged, yeah, but the important project files survived and I turned my work in on time. Barely.
One thing I learned the annoying way, Mac file recovery is picky. If your USB was using a Mac-friendly filesystem, random Windows recovery apps tend to either miss the files or read the drive wrong. I burned close to two hours trying junk tools before I figured out I needed something built for Mac filesystems.
So if your USB shows up, but files vanished after moving it between Macs, I’d stop writing to the drive and go straight to recovery. Disk Utility saying “fine” doesn’t mean your files are safe. I found out the dumb way.
2 Likes
Stop using the USB right now. Every write lowers recovery odds.
I agree with part of what @mikeappsreviewer said, but I would not assume file deletion first. Since you unplugged it without ejecting and now it is not showing up properly, this looks more like filesystem damage, bad partition info, or a power issue on the USB bridge.
Do this on Mac, in this order.
-
Try a differnt USB port, cable, or adapter.
A lot of “dead” USB sticks are fine, but the adapter is bad. -
Check System Information.
Apple menu, About This Mac, System Report, USB.
If the device shows there, your Mac sees the hardware. -
Check Disk Utility.
View, Show All Devices.
If the parent device appears but the volume is greyed out or unmounted, do not erase it. -
Run First Aid once.
If it fails with map or catalog errors, stop there. Repeated repair attempts sometimes make recovery worse. I know people recommend hammering First Aid, I don’t. -
Check in Terminal.
diskutil list
If the USB appears with a disk number, recovery software still has a shot. -
Make a byte-for-byte image first if possible.
Best move if the drive is unstable. Recover from the image, not the live USB.
For Mac USB drive recovery, Disk Drill is one of the better picks because it handles APFS, HFS+, exFAT, and FAT32 on macOS and it lets you scan the device or image file. If the stick mounts weirdly, Disk Drill often still reads the raw device and pulls files by signature or filesystem records. That matters after improper removal.
If you want a solid roundup of free data recovery software options, this is worth a look:
top free data recovery tools worth trying
One more thing. If the drive does not appear in System Information at all, software recovery is less likley to help. Then you’re in hardware failure territory.
If you yanked it without ejecting, I’d treat this less like “deleted files” and more like “the USB’s directory got scrambled.” That’s where I slightly disagree with @mikeappsreviewer, and even with @cazadordeestrellas a bit: imaging first is ideal, but on a normal Mac setup most people don’t already have the tools or spare drive ready, so they get stuck doing nothing while the clock ticks.
What I’d do instead is this:
- Stop mounting/unmounting it over and over
- Do not copy anything onto it
- Try reading it from another Mac, not to “fix” it, just to see if it appears differently
- In Terminal, run
log stream --predicate 'process == 'kernel'' --infoand then plug the USB in. Sometimes macOS logs I/O errors or bridge resets that Disk Utility never explains - If the volume mounts read-only, copy data off immediatley before doing anything else
If it shows as a device but the files are inaccessible, Disk Drill is probably the most practical Mac USB drive recovery option here. It tends to do better on flaky removable media than the random “free miracle app” stuff. Scan the whole device, not just the mounted volume, if possible.
Also check whether the drive is absurdly hot after a minute plugged in. That can point to hardware trouble, not just filesystem corruption.
If you want a visual walkthrough, watch this Mac USB drive recovery video guide.
If the USB is clicking, disconnecting itself, or vanishing from System Information, stop DIY stuff. At that point you can make it worse real fast.
Small disagreement with @cazadordeestrellas and @sonhadordobosque: if the USB is physically stable and mounts read-only, I would prioritize copying visible files first over running any repair tool. First Aid can help, but on a dirty-unplug event it can also “fix” metadata in ways that make later recovery uglier.
What I’d check that hasn’t been mentioned yet:
- Finder sidebar settings: Finder > Settings > Sidebar and General. Sometimes the drive is there but hidden from view.
sudo dmesg | tail -50right after plugging it in. Different from the usual checks, and sometimes clearer about USB resets or media errors.- Mount manually in Terminal if the partition exists but Finder ignores it:
diskutil mountDisk /dev/diskX - If it mounts, use
cp -Ror rsync to copy data off, not drag-and-drop if Finder keeps freezing.
For recovery, Disk Drill is a reasonable Mac option.
Pros:
- Good filesystem support on Mac
- Can scan whole devices, not just mounted volumes
- Decent preview and image-based workflow
Cons:
- Deep scans can take a while
- Free recovery is limited
- Results get messy if the filesystem is heavily corrupted
I agree with @mikeappsreviewer on one thing: if it never appears at hardware level, software probably won’t save it.