My external hard drive suddenly stopped showing up in Finder on my Mac, but it contains important files I need to recover. Disk Utility isn’t detecting it reliably. What can I do to access the drive and recover my data without erasing it?
If Disk Utility sees the drive only intermittently, recovery may still be possible, but assume the hardware is failing and minimize further use. Do not erase, initialize, repartition, or keep running First Aid. First try a different cable, port, power adapter, and a direct connection without a hub. In Disk Utility choose View > Show All Devices. Check System Information under USB or Thunderbolt too. If the physical disk never appears there, recovery software cannot access it.
When the disk stays connected, the safest approach is to create a byte-for-byte image or clone onto a healthy drive, then recover from that copy. If it appears as a physical device even though the volume will not mount, Disk Drill for Mac can scan the device or its disk image. Save recovered files to a separate drive, never back onto the damaged one. A long scan directly against an unstable disk can stress it further, so imaging takes priority when possible.
Stop powering it on if you hear clicking, beeping, repeated spin-ups, or if it disconnects every few seconds. At that point, a professional recovery lab is the realistic option for important files. Avoid opening the enclosure casually because some external drives depend on the enclosure’s bridge hardware or encryption to read the data.
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Whether the drive or its Time Machine backup was encrypted matters. Keep the password or recovery key handy, because even a successful clone or Disk Drill scan cannot turn encrypted data into usable files without it.
Stop reconnecting it repeatedly if it clicks, spins down, or disappears. Check whether macOS sees it under System Information > USB/Thunderbolt, then try a known-good cable, port, or enclosure. If it appears even briefly, clone it to another drive before running Disk Drill or First Aid, since scanning a failing disk can push it over the edge. @just_node is right about keeping the encryption password handy, but no recovery app can help if the Mac never detects the hardware at all.
Realistically, if the drive vanishes every few seconds, it’s often the enclosure bridge board dying, not the platters, so before you write off the disk itself try pulling the bare drive and connecting it through a cheap SATA-to-USB adapter. If it’s a portable 2.5’ drive that’s harder, but for a 3.5’ desktop unit it’s an easy check that Disk Drill or a clone attempt only becomes useful once the disk stays visible long enough to read.