Decide how important the existing files are
Before attempting a repair, ask whether the USB drive holds the only copy of important files. If it does, avoid writing to it, formatting it or running repeated speculative repairs. A prompt to initialise or format a disk does not mean its contents are empty or expendable. Read the full message and cancel any proposed erasure until you understand exactly what it would affect.
Record the error message and when the drive last worked. A familiar drive that has suddenly disappeared is a different case from a newly purchased empty device. That distinction determines how cautious the next steps need to be.
Compare the physical connection
Where possible, connect the drive directly to a suitable computer port instead of through several adapters and a hub. An external hard drive may also require its own power supply. Check the device's documentation for all required connections. A light on the enclosure shows some activity or power; it does not establish that data can pass successfully.
If the cable is detachable, compare it with a known compatible data cable. Change one connection at a time. Stop if you notice unusual noises, excessive heat or a damaged connector. Repeatedly reconnecting a drive with those symptoms is not a useful repair strategy and may make an existing problem worse.
Distinguish detection from normal file access
The system may detect a device without showing it in an ordinary file window. Use the built-in disk overview for observation and compare the reported model and capacity with your drive. Do not change partitions or accept an initialisation prompt. A listed capacity alone does not prove that the file system is healthy or readable.
An encrypted drive may need to be unlocked. A format used with another operating system may not be supported immediately on this computer. Establish where the drive came from and consult the relevant documentation. Avoid downloading an unfamiliar repair utility simply because it appears prominently in a search for the error message.
Use another computer to answer a question
If the drive shows no signs of physical damage or unusual noises, another trusted computer may establish whether the first computer is the problem. Use a machine you trust and do not run unfamiliar programs found on the drive. A workplace storage device should not be attached to a personal computer without permission.
If the contents become readable, copy the most important files to a safe location first and open a selection of the copies to check them. Copy rather than move, preserving the existing source. Once there is a verified backup, you can consider further diagnosis or replacement with less pressure to gamble on the original drive.
Stop early when the data cannot be replaced
If the drive remains unreadable through several suitable connections and computers, gather the observations for the manufacturer or a qualified recovery service. Include whether it was dropped or disappeared during a transfer. Do not open a hard drive yourself when the aim is to recover valuable files from it.
For a new drive known to contain no needed data, setup and formatting may be normal parts of getting started. Follow the appropriate instructions and confirm the selected device carefully. The same action has very different consequences on a drive containing the only copy of family photographs. The value of the files comes before the appeal of a quick repair.
Do not format before establishing what is on the drive. Check connections and copy important readable files first.
