External Hard Drive Not Showing Up

Look at Disk Management before you look for another cable

Almost everyone reaches for a different lead first. Ninety seconds spent on the truthful list is worth more. Right-click the Start button, choose Disk Management — the route is identical in Windows 10 and Windows 11 — and let it finish scanning. What you are looking at is every disk the machine can physically talk to, whether or not Windows has managed to make sense of what is on it. If your drive appears in that lower panel, the hardware is alive and the fault sits in the layer above it: a damaged partition entry, a volume marked RAW, or nothing more dramatic than a missing letter. Right-click the volume, choose Change Drive Letter and Paths, and give it one. That single action is safe. Very little else offered on that screen is.

Why initialise is the one word to refuse

Connect a disk whose partition table has been damaged and Windows will often greet you with a small dialogue asking to initialise it, offering MBR or GPT as though this were a routine setup step. It is not. The partition table is the index that records where each volume starts, how large it is and which file system it holds. Initialising discards that index and writes a fresh, empty one in its place. Your files are still on the platters afterwards, but the map to them has been replaced, and a job that would have taken an afternoon becomes a full surface scan hunting for whatever structures survived. Press Cancel. If somebody has already pressed OK, stop immediately and do not go on to create a volume or format it, because an initialise on its own is usually repairable and the steps after it often are not.

The same question, asked on a Mac

An external hard drive not showing up on a Mac follows identical logic. Open Disk Utility, then switch on View and Show All Devices so the physical disk appears above the volumes it carries. Three outcomes are common. The device is listed with a greyed-out volume under it, which means macOS can reach the disk but cannot mount what is on it. The device is listed with nothing under it, which usually means the partition map has gone. Or the disk is absent altogether, which points at the enclosure electronics or the mechanism itself. Leave First Aid alone if the drive is making any sound it was not making last month, because it puts a struggling mechanism under sustained load at the worst moment. Never press Erase. And rule out the dull answer before the dramatic one: an NTFS disk formatted for Windows will mount read-only or not at all under macOS, and an APFS disk means nothing whatever to Windows.

Seagate, WD Elements and LaCie: the case usually goes before the disk

A large share of what arrives here is portable, and in that pile the enclosure is the more frequent culprit: a USB hard drive not showing up is more often a dead bridge than a dead disk. A Seagate Expansion or Backup Plus, a WD Elements or My Passport, a LaCie Rugged or d2: each carries a small bridge board converting USB to SATA, and those boards fail with heat, age and being carried about in a rucksack. The light stays on, you can often feel the platters turning, and the computer reports nothing whatsoever. On the bench the disk is connected directly and read as though the shell had never existed. One warning before anybody takes a case apart on the kitchen table. Several WD and Seagate portables hold the encryption in the bridge board rather than in the disk, so a drive pulled out and plugged in bare reads as noise, because the key lived in the part you have just discarded. Send the whole unit and let the bench decide what comes out of it.

When it is not showing up anywhere at all

A drive absent from Disk Management and from the BIOS has stopped identifying itself, and no cable, port or operating system will talk it round. Two faults account for most of them. The circuit board may have failed, often taking a surge with it, in which case the disk never spins and the repair is a matched donor board with the original firmware chip transferred across. Or the heads cannot read the service area, a reserved region on the platters holding calibration data unique to that mechanism, which must load before the drive will even report a model number. That is clean-bench work. Neither is a logical fault, and the published rule is exact about what that means: no fix, no fee all jobs except electronic and mechanical failures, chip level work, DVR and Forensic jobs. Work of that kind takes 50% of the quoted price upfront, written down and agreed before anything is opened.

Getting it from Merseyside onto the bench

Drives come in from every corner of the city: student machines around Brownlow Hill and the two universities, studios and design firms in the Baltic Triangle, businesses out at Speke and Aintree, households across the water on the Wirral. There is no collection service anywhere in this network, so media is posted. Wrap the drive so nothing can shift, box it, and send it tracked to Manchester Data Recovery, Peter House, Oxford Street, Manchester M1 5AN. That is roughly 35 miles from Liverpool and next working day by tracked post. The diagnostic costs nothing and closes 2 working days after the parcel lands, one hard drive or SSD is £300 + VAT, and a USB pen drive or memory card is £250 + VAT. To talk it through before you pack anything, ring 0800 689 0668, Mon–Fri 9:00am–5:30pm. Related symptoms are covered on the RAW drive recovery and partition recovery pages, and a drive that is not showing up because it is clicking belongs on the clicking hard drive page instead.