Right-click on "My Computer" Click "Manage" Double-click "Disk Management" You will probably see Disk 0 and Disk 1 for your primary hard drive. Go to lower right portion of box and scroll down until you see Disk 2. It is probably your USB drive without a letter. It should show the size of the drive. Right-click in the left portion of that drive box (Disk 2) Click "Initialize" and "OK" in the next dialog box. This takes just a few seconds and it should now say "Online" in the "Disk 2" box. Right-click in the box to the right side of the "Disk 2" box (where it shows your disk drive size and says "Unallocated". Click "New Partition" and a "New Partition Wizard" will open up. Click "Next", then select "Primary Partition" and click "Next". Verify partition size (use entire disk size available unless you are creating multiple drives) and Click "Next". Assign drive letter ("F" is typical if CD-Rom is E) and click "Next". Format this partition with "NTFS", "Default", "New Volume" and click "Next". Then click "Finish" to exit the wizard and start formatting. Be patient... this can take awhile (it took just over an hour for a 320GB drive). When done, you should see an icon for your drive in Windows Explorer! hope this helps
The most likely reason you cannot see your hard drive on your Windows computer but can on your Mac, is that the drive has been formatted for GPT which is only supported on Windows Vista or 7 or above, not on XP. See the Microsoft article on GPT here and FAQ's on GPT here
click start control panel administrive tools ,computer management ,device manager look through all of your devices if you see a yellow question mark?or exclamation mark ! or red xright click to reinstall drivers or
if you can see your usb but its not workingports(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,
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
if this fails to fix the problem
you might have to install a usb 2 or 3 card they are cheap and easy to install you can buy these on Ebay very cheap hope this helps you
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