My external hard drive suddenly stopped showing up on my Mac, but it contains important files I need to recover. It doesn’t appear in Finder, and I’m looking for safe troubleshooting or data recovery options that won’t erase the drive.
Check whether the drive appears in Disk Utility with View > Show All Devices. That detail separates a Finder setting or damaged file system from a connection or hardware problem. If Disk Utility sees the volume but Finder does not, check Finder Settings > Sidebar and try selecting the volume in Disk Utility and clicking Mount. Do not choose Initialize, Erase, or Partition, even if macOS prompts you.
If the physical drive is missing there, check System Information under USB or Thunderbolt. Swap the cable, port, and power adapter if it has one, and connect it directly instead of through a hub. Trying another Mac can help confirm the issue. If no computer detects the physical device, recovery software will not be able to scan it.
When the device is detected but the volume will not mount, avoid repeatedly running First Aid until you have secured the files. First Aid can change file-system metadata, which is not ideal when the only copy of important data is on that drive. A recovery tool such as Disk Drill for Mac may be able to scan the physical disk even when the volume is unavailable. Save anything it finds to a different drive, never back onto the problem drive.
If the drive clicks, spins up and down, vanishes during scans, or transfers data extremely slowly, stop powering it on. Those symptoms point more toward hardware failure, and continued scanning can make recovery harder. For irreplaceable files, a professional recovery lab is the safer route. If the drive stays connected reliably, creating a full disk image or clone first is preferable to repeatedly scanning the original.
Check the drive’s reported capacity in Disk Utility before starting a recovery scan. If it shows the correct size and stays connected, software recovery is reasonable. If it reports 0 bytes, the wrong size, or keeps disconnecting, suspect the enclosure electronics or the drive itself. Don’t automatically move it into another enclosure, since some external drives use encryption tied to the original USB board. In that case, preserving the original enclosure and using a recovery lab may save you from making the files inaccessible.
The order you do things in matters more than which tool you pick. If the drive is at all flaky, imaging it comes before any scan, not after you’ve already run scans twice and it drops off mid-read. @retro_hawk225 mentioned cloning as a nice-to-have near the end, but I’d move it right to the front for anything that disconnects randomly. Every extra spin-up on a dying drive is borrowed time.
For a drive that’s physically struggling, a straight clone tool often chokes because it retries bad sectors forever. That’s where ddrescue is worth knowing about. It’s free, it skips the hard areas first, grabs everything readable fast, then circles back for the stubborn parts. Command line and not pretty, but it’s built exactly for failing media and costs nothing. Disk Drill can also make a byte-for-byte image, which is fine if the drive is stable, but I wouldn’t lean on a gentle imager for hardware that’s already misbehaving.
The bit nobody’s said outright: decide early whether the files are worth lab money or not. If they’re truly irreplaceable and the drive is clicking, stop touching it and price a lab quote before you experiment. If they’re just annoying-to-lose, then imaging plus a recovery scan onto a spare drive is a reasonable gamble. Trying to have it both ways, poking at a failing drive while hoping a lab can still save it later, is how people end up with neither option working.