How to Recover Files from a Dead or Unrecognized Mac Hard Drive

When a drive suddenly stops showing up — or mounts but throws errors — it's easy to assume the worst. But a "dead" drive is frequently not dead at all. Often the hardware is fine and the filesystem is just damaged, which is very recoverable. The key is figuring out which kind of failure you're dealing with before you do anything, because the wrong move on a physically failing drive can turn a recoverable situation into a permanent loss.

This distinction decides everything that follows.

Physical failure means the hardware itself is broken. The tell-tale signs are sounds and behavior: clicking, grinding, buzzing, or repeated spin-up-and-stop noises; a drive that gets unusually hot; or one that won't power on at all. If you hear or see any of this, stop immediately. Do not keep plugging it in, do not run scans, and do not try DIY tricks. Every spin of a physically failing drive can cause more damage. Power it down and consult a professional data-recovery lab, which can open the drive in a cleanroom and work on the hardware directly. Software cannot help with physical failure, and attempting recovery can make the data permanently unrecoverable.

Logical failure means the hardware works but the data is inaccessible — a corrupted filesystem, a damaged partition map, a drive that mounts but shows nothing or errors out. This is the recoverable kind, and the rest of this guide is about it. The drive is quiet and behaves normally; it just won't give you your files.

If the drive isn't making bad noises, run through these steps in order. Each one rules out a simple, fixable cause before you reach for recovery software.

Try a different cable, port, and Mac. A surprising number of "dead drive" cases are a bad USB cable, a flaky port, or a hub that isn't supplying enough power. Swap the cable, plug directly into the Mac (not through a hub), try another port, and if you can, test the drive on a second Mac. This quickly separates a drive problem from a connection problem.

Check Disk Utility. Open Disk Utility and look at the sidebar with "Show All Devices" enabled (View menu). If the physical drive appears but its volume is greyed out or unmounted, the hardware is being detected — a good sign that the problem is logical. Try mounting the volume.

Run First Aid. With the volume selected in Disk Utility, run First Aid. It can repair minor filesystem damage and get the drive mounting again. Important caveat: if your files are precious and the drive is questionable, consider imaging or scanning before running repairs, since First Aid writes to the drive. If First Aid mounts the drive cleanly, copy your important files off to another drive right away.

For a pulled internal drive, use an external enclosure or dock. If you removed a drive from a dead Mac, put it in a USB enclosure or dock and connect it to a working Mac. This lets you access it as an external drive and scan it normally — without depending on the original failed machine.

Once the drive is detectable — even if it won't fully mount — recovery software can read it directly. Download DataRecover Pro and run a free scan. Crucially, install it to a different drive than the one you're recovering from, and let the scan open the source drive strictly read-only, so the act of scanning never writes to or further stresses the drive.

Start with a quick scan to read whatever filesystem structure survives (APFS, HFS+, NTFS, exFAT, or FAT32) and surface files with their names intact. If the filesystem is too damaged for that — common with corrupted or unrecognized drives — run a deep scan, which bypasses the filesystem entirely and carves files from the raw disk blocks by their signatures. Deep scanning is exactly the mode for a drive whose filesystem is broken, because it doesn't need the filesystem to work at all. DataRecover Pro can also rebuild a damaged APFS volume from a prior checkpoint, which sometimes brings an unreadable APFS drive back into view.

Always save recovered files to a different drive than the source — never back onto the drive you're rescuing. With a failing or unreliable drive this is doubly important: you want to pull data off it as quickly and with as few writes as possible. Preview your files first (thumbnails, Quick Look, and confidence scores are free) to confirm they're recoverable, then recover the ones you need to a healthy external drive or another volume.

If any recovered files won't open afterward, DataRecover Pro's repair engine can rebuild corrupted photos, videos, and documents — useful when files come off a flaky drive in less-than-perfect shape.

Two situations call for stopping and getting professional help. The first is any sign of physical failure — clicking, grinding, heat, or a drive that won't power on. The second is a drive that starts behaving worse during recovery: new noises, repeated disconnects, or scans that keep failing partway. If the data is irreplaceable and the drive seems to be deteriorating, don't keep hammering it. Power it down and take it to a data-recovery lab, where specialists can work on the hardware in a controlled environment.

If the loss turns out to be a formatting issue rather than a failing drive, the approach is a bit different — here's how to recover data from a formatted hard drive on a Mac. And for the full rundown of every recovery scenario, see the complete Mac data recovery guide.