Computer won't recognize external usb hard drive
try it on another computer if that dosent work you should
reformat your computer but first backup all your data by putting your another internal hardrive on your computer and move all your files you need to the empty hardrive and after that take the hardrive with all your stuff in it off the computer and then reformat the hardrive which the external hardrive does not work on and install a new operating system then put the other hardrive with all your stuff back on your computer and transfer your stuff into the hardrive with a operating system then try the external hardrive
OR
you can burn all your stuff into a CD or a DVD
OR
you can put all your stuff into FlashDrives and then after you reformat the hardrive with an operating system put your stuff back into the computer and after that the external hardrive should work
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