I was given a USB flash disk with two issues: When I copy a file on it and then attempt to eject it, the well-known error message 'The device is now in use' appears. When I disconnected and replugged it, it was empty, as if I hadn't copied any files. I'm willing to go to extraordinary lengths to save this USB. I appreciate your help.
You lose the files you saved to the USB stick and possibly other data. Some operating systems do not copy the data to the stick until you click "eject". Because USB sticks have a limited number of write cycles, they are stored in computer memory so you can update them numerous times before writing.
So, if you remove it without clicking eject, your data will still be there, but you won't be able to find them. Worst case, the directory information will be present, but the fact that the space was used will not be. So the next time you use the stick, the following file takes up the same room as the previous one, and the two files corrupt each other.
But if you only read from the stick, I don't see how anything wrong can happen. So it's usually a good idea to unplug your device after carefully ejecting it, and failure to do so exposes your data to corruption or loss.
You risk losing vital data when discovering and fixing a damaged USB flash drive. To be safe, resort to data recovery services with years of expertise dealing with such issues.
Every few years, replace your flash disk. The memory chip in your flash device might wear out over time, so replacing it regularly helps protect your data. If your USB flash drive is still inaccessible and unreadable, you may need to contact data recovery pros.
EaseUS Data Recovery Wizard is a dependable and easy-to-use flash drive data recovery software that allows you to access a corrupted disk and recover your data.
You can take steps to protect your data from corruption.
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