computer management external drive cant do anything to its its showing online but cant give it an letter or format or anything

[mrseeps]

computer management
external drive SHOWS but cant do anything to its its showing online but cant give it an letter (seems like what it needs)also cant format or anything.

 

[Phillip Corcoran]

Test it to ascertain it's state of health.

If it's a WD drive, test it with Data LifeGuard Diagnostic for Windows: http://support.wdc.com/product/download.asp?groupid=304&sid=3&lang=en
(Ignore the model shown, the software is not model-specific)

For any other brand, test it with SeaTools for Windows:
http://www.seagate.com/gb/en/support/downloads/item/seatools-win-master/