You plugged in an external hard drive or SSD and… nothing. No icon on the desktop, nothing in the Finder sidebar. Nine times out of ten this is a settings or formatting issue, not a dead drive — and the fixes below are ordered from fastest to slowest.
First: find out where it is missing from
Open Disk Utility (Spotlight: press Cmd-Space, type Disk Utility). This one check splits the problem in half:
- Drive appears in Disk Utility but not in Finder → it is a mounting, formatting, or Finder-settings problem. Fixes 1, 4, 5, and 6 below.
- Drive does not appear in Disk Utility at all → it is a power, cable, port, or hardware problem. Fixes 2, 3, 7, and 8.
The 9 fixes, fastest first
1. Tell Finder to actually show external drives
macOS ships with desktop drive icons turned off on many setups. In Finder, open Finder > Settings > General and check External disks. Then click the Sidebar tab and check External disks there too. The drive may have been mounted and working the whole time — just invisible.
2. Try a different port and a different cable
Data cables fail more often than drives do, and charge-only USB-C cables look identical to data cables. Swap the cable first, then try every port on the Mac. If the drive shows up on one port but not another, the silent port may be failing — see our USB-C port troubleshooting guide.
3. Check the power situation
Desktop-size spinning drives (3.5-inch) need their own power brick — confirm it is plugged in and the drive spins up. Portable drives running through an unpowered hub or a long dongle chain often do not get enough bus power. Plug the drive directly into the Mac to rule the hub out.
4. Mount it manually in Disk Utility
In Disk Utility, choose View > Show All Devices. If the volume is listed but greyed out, select it and click Mount in the toolbar. If it mounts, you are done — macOS just failed to auto-mount it (common after an unsafe eject).
5. Run First Aid
Still greyed out or the Mount button errors? Select the volume, click First Aid, and let it repair the directory structure. Run it on the volume first, then on the parent device. If First Aid fails repeatedly, skip ahead to the honest part below — the drive itself may be failing.
6. NTFS: the drive that shows up but acts broken
If the drive came from a Windows PC, it is probably formatted NTFS. macOS reads NTFS but cannot write to it — files open, but you cannot save, delete, or copy onto the drive. That is not a malfunction; it is a format mismatch. Copy anything you need off it, then reformat it as exFAT (works on both Mac and Windows) using the steps in the reformat section below.
7. Approve the accessory (Apple Silicon laptops)
MacBooks with M-series chips ask permission before talking to new USB and Thunderbolt accessories. If you dismissed the "Allow accessory to connect?" prompt, the drive is being ignored. Unplug it, plug it back in, and click Allow. You can change the behavior under System Settings > Privacy & Security > Allow accessories to connect.
8. Restart, then reset (Intel Macs)
A plain restart clears a stuck USB stack more often than anyone wants to admit. On Intel MacBooks, resetting the SMC and NVRAM can also revive dead ports: shut down, then hold Shift-Control-Option plus the power button for 10 seconds (SMC), and hold Option-Command-P-R at startup (NVRAM). Apple Silicon Macs handle both automatically — a normal restart is the equivalent.
9. Ask Terminal what macOS really sees
Open Terminal and run diskutil list external. If the drive appears there but nowhere else, note its identifier (like disk4) and run diskutil mountDisk disk4. If it does not appear in Terminal either, macOS genuinely cannot see the hardware — the problem is the cable, the enclosure, the port, or the drive itself.
The honest part: dead drive vs. dead port
Test the drive on another computer. If it works elsewhere, your Mac is the problem — usually a failed port or, on older machines, a failing logic board. If the drive is dead everywhere and the data matters, stop plugging it in (each spin-up of a failing mechanical drive risks more damage) and weigh professional data recovery.
If it is the Mac side that failed, you do not have to eat the loss: we buy MacBooks with bad ports and dead logic boards. Get a trade-in quote for a broken MacBook — and if the internal drive is what died, see what a MacBook with a failed SSD is still worth.
Reformatting for Mac use
Once your files are safely copied off, Disk Utility > select the drive (Show All Devices, pick the top-level device) > Erase:
- APFS — best if the drive will only ever live on Macs (including Time Machine backups).
- exFAT — pick this if the drive moves between Mac and Windows.
- Scheme: GUID Partition Map — always, when the option appears.
Related guides
- MacBook USB-C port not working? Every fix in order
- MacBook ports explained: what do you actually need?
- How to back up your Mac with Time Machine
- All guides →
Frequently Asked Questions
Why is my external hard drive not showing up on my MacBook?
Most often: Finder is set not to display external disks, the volume failed to auto-mount, the drive is NTFS-formatted from a Windows PC, or a charge-only cable or unpowered hub is starving it. Check Disk Utility first — where the drive is missing from tells you which fix to run.
My drive shows in Disk Utility but not in Finder — why?
The volume is not mounted. Choose View > Show All Devices, select the greyed-out volume, and click Mount. If mounting fails, run First Aid on the volume, then on the parent device.
Why can I see my files but not add or delete anything?
The drive is formatted NTFS (Windows format). macOS reads NTFS but never writes to it. Copy your files off, then reformat the drive as exFAT if it must work on both systems.
The drive works on Windows but not on my Mac. Is the Mac broken?
Not necessarily — an NTFS or unsupported partition scheme can make a healthy drive act invisible. But if no drive works on that port while others do, the port has likely failed. Test with a second device before blaming the drive.
Do you buy MacBooks with broken ports or dead drives?
Yes. A failed port or dead internal SSD does not zero out a MacBook — the screen, board, keyboard, and shell all hold value. Start a quote on our broken MacBook trade-in page and get a real number the same day.