My WD My Passport for Mac worked fine for years, but now it suddenly will not mount on my Mac. The drive powers on, but it is not showing up like it used to, and I need help figuring out if this is a Mac issue, a drive failure, or a way to recover my files.
I’ve run into this on Macs more times than I wanted to. The drive looks dead, Finder shows nothing, and it always seems to happen when you need the files now. Most of the time, the disk itself is still there. The usual mess is between macOS and the file system, not your data vanishing.
Start with the boring checks first, because they fix a lot more than people admit.
Swap the cable. Use a different USB port. Skip the hub and plug the drive straight into the Mac. Then open Finder settings and make sure external disks are allowed to show up under General and Sidebar. If the drive light is on, or you hear it spin up, I’d treat hardware failure as unproven for the moment.
The fast fix is formatting the drive. It also erases everything. So if the files matter, stop there. Don’t rush into repairs before you pull the data off.
macOS gets picky with damaged file systems. Even small corruption is often enough for it to refuse the mount. I’ve had better luck going around the mount issue and reading the disk directly with recovery software. Disk Drill has worked well for me when Disk Utility shows a drive as grayed out, unmounted, or uninitialized.
If you use it, do the byte-to-byte backup first. I learned this the hard way. Scanning a flaky drive over and over is how you make a bad day worse. A full clone gives you a safer copy to work from. After that, scan the clone, preview the files, and recover them somewhere else. Once the important stuff is out, you’ve got room to try repairs without sweating every click.
What I usually try before erasing the disk
1. Show all devices in Disk Utility
This one gets missed a lot. Sometimes you’re selecting the damaged volume, when the repair needs to happen on the parent disk.
1. Open Disk Utility.
2. Click View, then choose Show All Devices.
3. Pick the top-level physical drive, usually named after the maker, like WD or Seagate.
4. Run First Aid there first.
If the partition map was the issue, the drive sometimes mounts right after.
2. Kill a stuck fsck process
If the disk got unplugged without ejecting, macOS may be holding it hostage with a file check in the background.
1. Open Terminal.
2. Run sudo pkill -f fsck
3. Enter your password.
On some systems, the disk pops back onto the desktop a few seconds later. Weird fix, but I’ve seen it work.
3. Reset NVRAM and SMC on Intel Macs
I wouldn’t start here, though I’ve seen flaky USB behavior clear up after a reset. If you’re on Apple silicon, a normal restart handles the low-level reset stuff on its own.
For NVRAM:
1. Shut down the Mac.
2. Turn it on and hold Option + Command + P + R for about 20 seconds.
For SMC on Intel:
1. Shut down.
2. Unplug power for 15 seconds.
3. Plug it back in.
4. Wait 5 seconds.
5. Power on.
On some MacBooks, the key combo is Shift + Control + Option + Power for 10 seconds. Apple changed this enough times to make it annoyng, so double check your model if needed.
4. Try mounting it in Terminal
Disk Utility fails in ways Terminal will at least explain. I like this step because the error message often points to the real problem.
1. Open Terminal.
2. Run diskutil list
3. Find your disk identifier, something like disk4s1
4. Run diskutil mount /dev/disk4s1
If it works, you’ll see “Volume mounted.” If it fails, macOS usually tells you why. Sometimes the message is blunt enough to save you 20 minutes of guessing.
If none of it works
At that point I’d go back to the wipe-and-rebuild option, but only after the files are recovered.
Open Disk Utility, select the drive, click Erase, and choose the format based on where you’ll use it:
APFS for Mac-only use.
exFAT if you need the drive to move between Mac and Windows.
This usually clears logical corruption and gets the disk usable again. The key part is order. Recover first. Repair later. I didn’t always do it in that order, and yeah, I regretted it.
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If the drive powers on but does not show in Finder, I would check System Information before anything else. This tells you if macOS sees the hardware at the USB level.
Open Apple menu, About This Mac, System Report, then USB. If your WD My Passport appears there, your Mac sees the enclosure. If it does not, I lean toward cable, port, enclosure board, or power draw.
I differ a bit from @mikeappsreviewer on one point. I would not jump to fsck tweaks early unless the disk is clearly visible in Disk Utility or Terminal. First figure out where detection stops.
A few checks people skip:
- Test on another Mac or a Windows PC. Fast way to split Mac issue from drive issue.
- If the drive is encrypted by WD software, uninstalling old WD utilities or granting newer macOS permissions sometimes fixes the mount fail.
- In Terminal, run diskutil list external. If the physical disk shows with no volume name, the partition map is damaged.
- Check Console logs right after plugging it in. Search for I/O errors, diskarbitrationd, or USBMSC. Repeated I/O errors usually mean failing hardware.
If files matter, skip erase. Use Disk Drill to see if the drive is readable enough for recovery. If the SMART status is failing, stop messing with it and copy data off first. Repeated mount attempts on a dying drive is how pepole lose the last readable sectors.
For extra reading, here is a solid thread on fixing an external hard drive not mounting on a Mac, with more clear steps and cases:
how to fix an external hard drive not showing up on Mac
If the disk shows in USB but nowhere in Disk Utility, I would suspect the enclosure more than the platters. WD Passport units fail there more often than poeple think.
If it powers on but does not mount, I’d check one thing the others only touched on lightly: whether the volume is hidden or the mount point is broken, not just whether the disk is damaged.
In Terminal, run:
diskutil list
ls /Volumes
If the WD partition appears in diskutil list but Finder still acts dumb, try:
sudo mkdir -p /Volumes/TestMount
sudo mount -t hfs /dev/diskXsY /Volumes/TestMount
Swap diskXsY with the actual partition. If that fails with an input/output error, that leans hardware. If it mounts, Finder may be the problem, not the drive.
I also kinda disagree with going too deep into resets early. NVRAM/SMC can help sometimes, sure, but with these WD Passports I’ve seen the USB-SATA bridge inside the enclosure go flaky long before the actual disk fully dies. That’s why @vrijheidsvogel’s enclosure suspicion makes sense.
Another angle: if this is an older WD My Passport for Mac, check whether it was formatted HFS+ and now your macOS version is choking on a damaged journal. In Disk Utility, if you see the disk but the volume is greyed out, don’t keep hammering “Mount” 20 times. That can make a weak drive worse.
If the files matter, I’d do recovery before any erase attempt. Disk Drill is fine for that, especially if the drive is visible at all and you just need to pull data before trying fixes. Also this Disk Drill data recovery walkthrough for Mac external drives is pretty easy to follow.
One more practical test nobody mentioned much: boot the Mac into Safe Mode and plug the drive in there. If it mounts in Safe Mode, some background extension, old WD utility, or login item is interfering. Sounds dumb, but I’ve had weirder stuff happen on macOS tbh.