This solution worked for me:, pretty much what Oldturkey said.
Computer Management, Disk Management,
Right click the (Healthy) Primary Partition - of the size of hdd without drive letter,
Select "Change drive letter and paths..."
I had a Toshiba hdd from a friend that wouldn't even initialize so couldn't add a drive letter, I ended up very pleasingly pulling it apart and smashing it to bits before throwing it in the trash, very disappointed it didn't have the massive magnet in it that the old hard drives used to have. (Bought the friend a new hdd double the size to compensate - was told there was nothing on it anyway)
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Have you tried another computer and/or another USB port? this could be caused by plenty of other issues as well, i.e. bad wiring, bad connection, failed circuit board as well as a failed drive. Data recovery can be expensive and is not easy to do for the DIY'er. So look for the things that could be done by you.
I have a WD 4TB Elements Portable External Hard Drive, USB 3.0 with the same problem. I've only had it for 13 months and the other day it just stopped working. Tried it on numerous computers. It shows up under disk drives, but not disk management. I've done everything I can think of, but can't get it to be recognized. Is there any way I can retrieve my data or get it to work?
my 1 tb wd element is not working when i connect it it is not showing in disk management but in it shows in disk drive under device manager how ican get data from it
из Pankaj Taneja