You must be logged on as an administrator to perform these steps.
Windows typically assigns a letter of the alphabet to most drives.
If you want to organize your drives in a certain way, you can change the drive letter.
You can assign any letter to a drive as long as long as the letter isn't already in use by a different drive.
To see which drive letters are in use
Open Computer by clicking the Start button, and then clicking Computer.
Open Computer Management by clicking the Start button clicking Control Panel, clicking System and Security, clicking Administrative Tools, and then double-clicking Computer Management.
If you're prompted for an administrator password or confirmation, type the password or provide confirmation.
In the left pane, click Disk Management.
Right-click the drive that you want to change, and then click Change Drive Letter and Paths.
Do one of the following:
To assign a drive letter if one has not already been assigned, click Add, click the letter that you want to use, and then click OK.
To change a drive letter, click Change, click Assign the following drive letter, click the letter that you want to use, and then click OK.
To remove a drive letter, click Remove, and then click Yes to confirm that you want to remove it.
Initialize New Disks
http://technet.microsoft.com/en-us/library/cc771486.aspx
click start control panel administrative tools computer management device manager scroll down universal serial bus controllers you could see a yellow question / exclamation mark? ! or a red X
you will need to update/reinstall drivers
right click to reinstall drivers
if you can see your usb but its not working
ports(com&lpt)right click update driver
sometimes the wires inside the cable will be damaged due to bending or stretching or placing heavy equipment upon the cable
just replace the cable of the hard disk, when you plugged the external disk drive you got that windows could recognize the USB device change the cable everything should work fine again,
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
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 to a computer and its parts
hope this helps
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