Before you remove the disk, look in the bottom right corner of your laptop/computer. You should see a new icon (it may have a green arrow, hover over it & it should read "Safely Remove Hardware"). Double-click on it, when the box pops up, under "Hardware devices:" select & double-click "USB Mass Storage Device", you'll be asked to confirm device(s) to be stopped, just look for your flash drive name brand (ex. SanDisk Cruzer Glide USB Device), hi-lite (click once & to make it gray) then click OK. A white box will pop up in the lower right which will read "Safe To Remove Hardware". That should do it.