My external hard drive suddenly stopped showing up on my Mac, Finder, and Disk Utility. It contains important files I need to recover. How can I safely access the drive or restore the data without formatting it?
Do not erase, initialize, repartition, or run First Aid on the original drive yet. Those actions can write to the disk and make recovery harder.
Start with the hardware path: try a different cable, port, power adapter, and another Mac if available. In Disk Utility, choose View > Show All Devices. Then check System Information under USB or Thunderbolt, or run diskutil list in Terminal. If the drive appears there but will not mount, recovery software may still read it. Scan it with Disk Drill for Mac, preferably after creating a byte-for-byte image, and save recovered files to a different drive.
If the disk is missing from System Information and diskutil list, software cannot access it. Repeated disconnecting will not fix a failing mechanism. Clicking, beeping, disappearing after a few seconds, or failure to spin up are signs to stop powering it on and consider a professional recovery service, especially if the files are irreplaceable.
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Do not install recovery software on the problem drive or save recovered files back to it. If macOS detects the USB enclosure but no actual disk, the enclosure’s SATA-to-USB electronics may have failed. For a standard removable SATA drive, a compatible enclosure or dock is worth trying. Avoid opening sealed, soldered-USB, encrypted, or RAID units. Once the disk appears, image it first, then scan the image with Disk Drill or another recovery tool.
Shut the drive down, then try a different cable, USB port, and power adapter if it has one. After reconnecting, check Apple menu > System Settings > General > About > System Report, then look under USB or Thunderbolt. If the drive is missing there too, recovery software cannot access it because macOS is not receiving a device at all.
I would avoid repeatedly reconnecting it or running First Aid if it clicks, beeps, spins down, or keeps disconnecting. Those symptoms point toward hardware trouble, and extra attempts can reduce the chance of recovery. For irreplaceable files, that is the point where a data-recovery lab makes more sense than experimenting.
If System Report sees it and the disk later appears in Disk Utility, do not initialize, erase, or repair it yet. @greengeekpoint is right about imaging first. Work from the image with Disk Drill for Mac or another recovery tool, and save everything to a separate healthy drive.
Two drives can look identical when they vanish from Finder but be worlds apart underneath. One is a healthy disk that lost its enclosure board, so the platters are fine and any recovery tool will happily read it once you get past the dead electronics. The other is a drive with a scored head or a seized motor, where every power-on shaves off a bit more of what you can save. The advice in this thread mostly assumes the first case. Your job before touching software is figuring out which one you actually have, and the noises the drive makes tell you more than Disk Utility ever will.
The point I’d push on is the encryption angle, because nobody’s mentioned it. If that drive was APFS encrypted or you had FileVault turned on, recovery software can see every block and still hand you scrambled nonsense without the password or key. So before you spend hours imaging and scanning, be honest about whether it was locked. That changes the whole plan.
@swifthiveedge is right that a swapped enclosure or dock is the cheap win for a bare SATA drive, and it’s genuinely worth trying first if the disk isn’t clicking. Disk Drill fits fine as the scanning step once the disk shows up, and its preview lets you see if files are actually intact before you commit, but treat it as the read stage, not a fix. It won’t revive dead hardware and it won’t decrypt anything for you. If the drive is silent and never spins, or if it was encrypted and the key is gone, more software attempts just burn time you could spend deciding whether the files are worth a lab quote.