if you are referring to a pen drive and not your hitachi 500 gb sata hard drive
click start control panel administrive tools computer management device manager scroll down universal serial bus controllers you should see a yellow question mark?
right click to reinstall drivers
if you can see your usb drive but its not working
ports(com&lpt)right click update driver if this fails to fix the problem
click start control panel administrive tools computer management disk management right click on your drive select properties click tools you should see click check now click start two boxes automatically fix files and scan for and attempt recovery of bad sectors place then a tick in both boxes then select check now start or you might tick one box then return after its finished the first repair then return and tick the second box you should not do anything while the chkdsk utility is in progress any input may damage this drive hope it helps
if this fails to fix the problem
check the USB leads that attach to the motherboard usually red white green black make sure they are securely seated and have no dust build up on them dust will cause static and a lot of unforeseen problems for a computer and its parts also
scroll to disk drives if you can see your drive + to expand right click you should see options update driver disable uninstall scan for hardware changes
select properties you should see options in the general tab to troubleshoot policies volumes driver and details under the driver tab you will have the options to check the driver details update driver rollback driver or uninstall
then if you want/need to format click start click on computer then right click on your usb pendrive drive select format
hope this helps
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