I have a problem with using a flash drive with my acer aspire one. when I copy onto it from my desktop, the information is still there, but when I plug it into the acer, some of the data is missing. I did a virus scan and nothing came up . Any suggestions?

The problem may be improper removal of the flash drive from the desktop. Copying of data, especially large amounts of data, most likely involves caching (buffering) to the flash drive as it is much slower to write than it is to read it from the desktop computer's hard drive. The proper way to remove the flash drive after copying is to first left click on the Safely Remove Hardware icon that should be in the Taskbar at the bottom right of the desktop's screen. Then on the little pop-up window, there is a list of devices that can be removed. If there is more than one item, be sure to click on the Safely remove USB Mass Storage Device - Drive (drive letter for the drive you were copying to) for the flash drive in question. Then in a few moments, you should get a Safe to remove hardware pop-up after which you can unplug the flash drive knowing that any caching or buffering has been completed and the ALL of the data has been written to the flash drive. If you don't do this every time you write to the flash drive before removing it, there is a good chance that some data will only be partially written when you unplug the flash drive. If all you are doing is to read the flash drive then the step to safely remove it is unnecessary but doing it anyways is a good practice to establish. If you do have a flash drive that is partially written, you may want to reformat it since likely there will be some corruption somewhere on the flash drive which may cause problems later on even if you implement the safe removal practice.