If you have plugged in your flash drive and opened My Computer and found that it is not in the list of drives then chances are I can help!
Right click on My Computer - Click manage
Double click Disk Management
Right click the flash drive and click Change Drive letter and paths
Make sure the drive letter you assign it is not one that is mapped to something like your gradebook drive or your documents on the server.
Done!

1 comment so far ↓
very useful tip. I have this issue with every new drive that I buy and bring to school. of course I can never remember this and have to look it up each time.