|Your problem was probably caused by you NOT clicking on the Safely Remove Hardware icon and STOPping accessing the drive when you unplugged it while Windows was running. Usually you can use a program to recover your data that appears to be missing now. |
Troubleshooting USB device problems including for flash drives, external drives, memory cards.
See Response 1:
Check that out first.
Rarely, not all the ports on the back of a desktop case may be able to supply 500ma each.
If you have a desktop computer, Note that I answered a Topic on this site where a guy had an external drive, which does require the full 500ma, connected to a port on the back of a desktop case - it would not work properly when a webcam was in the port next to it, but it worked fine when the webcam was unplugged. Ports on the back of a desktop case often have two ports connected to the same USB controller module that are ports one above the other - you could try connecting the cable to one of those and leaving the other un-used.
"I created a folder and added files to it and they are there."
If you did that AFTER you thought the files were not there, you may have overwritten areas on the hard drive partition where the data for the "invisible "files were stored - you may not be able to recover such files in that case.