text: usb flash drive is invisible? usb flash drive just stopped working and became invisible in the window explorer.  my win xp doesn't detect it anymore.  please help.  thanks. -rodney do you have a second pc to test the usb drive with? check second pc make sure device is still functional.  does the drive still light up? getting power? if not its busted.  did you add a new drive or changed drive letters recently? some systems will not recognize the usb drive beyond letter g:  did you remove the drive with out "safely removing device"? if you did so and the device still lights when connected, go into device manager check for any installed usb devices assocaited witht he usb drive (ussually manufacturer's name) and uninstall it. then scan for hardware changes and hopefully the pc will detect the usb drive