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External Hard Drive Problems? Fixes (2026)
Common external hard drive problems: drive not recognised, slow transfers, clicking sounds, and files that will not copy.
Most external drive trouble comes from cables, ports, power, or format, not from a dead drive. Work through these fixes in order before considering a replacement, and copy important files elsewhere first if the drive is still readable.
The drive is not recognised by the computer
Try a different USB port, preferably one directly on the computer rather than a hub, and try the supplied cable or a known-good replacement, since cables fail more often than drives. Listen for the drive spinning up: silence on a desktop drive usually means a power problem, so check the adapter and socket, while silence on a portable drive can mean a port that supplies too little power. If the drive appears in disk management but not in file explorer, it may need a drive letter assigned or a format your system understands.
Transfers are very slow
Confirm you are using a USB 3 port, usually marked in blue or with a superspeed symbol, rather than an older USB 2 port, since the difference is large. Avoid copying thousands of tiny files in one session where possible, since small files transfer slower than a few large ones, and close other heavy programs during a big copy. If one drive is slow on every computer while others are fast, the drive itself may be failing, so copy its contents elsewhere promptly.
The drive clicks or makes unusual sounds
Stop using the drive for anything except copying its contents to a replacement, since clicking often signals a mechanical problem that worsens with use. Copy the most important files first, in small batches, and do not run repair tools that write heavily to a clicking drive. If the contents matter and the drive stops responding, a data recovery service is the safer route than repeated DIY attempts.
The drive disconnects during transfers
Check the cable connection at both ends, since a loose micro-USB connector is a common cause, and avoid moving the drive during a transfer. Try a shorter cable and a port directly on the computer, and disable any power-saving setting that puts USB ports to sleep during long copies. Persistent disconnections on every cable and port point to a failing drive or enclosure, so back the contents up while you still can.
Questions, answered
Why does my drive show less space than advertised?
Because manufacturers count capacity in decimal units while operating systems count in binary units, so a drive labelled 2TB shows a smaller usable figure on screen. The difference is normal and expected, and it applies to every brand, not just the drive you bought.
Should I always eject a drive before unplugging it?
Yes. Ejecting tells the computer to finish any pending writes before the connection breaks, which prevents corrupted files and damaged folders. It takes a second and it prevents the most common cause of mysterious file damage on external drives.
Can I recover files from a drive that stopped working?
Sometimes, depending on the failure. If the enclosure or cable failed but the drive inside is healthy, a new enclosure may revive it. If the mechanism itself failed, professional recovery is the realistic option, and it is expensive, which is why a second backup copy matters more than any recovery trick.