I've been having issues with my external hard drive as of late. It freezes up whenever I attempt to transfer files from it so I ran a disk error check. I let it run and I came back home to find my computer in sleep mode. When I turned it back on it showed me it had completed the check but now my drive is a bit strange.
It shows in the computer TAB to have 0 bytes of space and I can't access it at all. I've attempted to format it and delete it's volume but it refuses to even try.
In the disk management tab it shows the appropriate size and space it should have but I'm still unable to do anything to it. It shows itself as a RAW system type which I haven't seen before.

Any assistance WOULD be appreciated.
I'd run crystaldisk info on it the ad-free version that is at this site. And see what it reports. The drive might be junk and you might want to exercise a WARRANTY replacement on it. Drives depending on brad can have anywhere from 1 year to 5 year replacement warranty on them. Also some drives that the company gets bought out by others inherit the warranty of the company inheriting the obsolete brand such as MAXTOR drives bought out by Seagate and a drive that under Maxtor's warranty was a paperweight and out of warranty, when Seagate bought out Maxtor I heard that they were offering 5 year warranty on Maxtor drives in which my 500GB Maxtor that failed was then covered by seagate and for the cost of shipping around $8, I got a replacement 500GB SATA drive from seagate in about 2 weeks under their warranty.

http://crystalmark.info/download/index-e.htmlI have had this problem; the disk disappeared from the USB system but reappeared again with RAW format.  Now I reckon the problem might have been a faulty connection, either a cable, or a connector within the external drive or your PC.  Try replacing the cables with known good ones and then using a completely different USB port on your PC, eg back/front.
Have you disconnected and reconnected your external drive ?  This can bring it back although it will probably become electrically disconnected again.
Have you tred running your computer in 'Always On' mode ? or 'Hard disks off - never'
Can you try it on another computer ?

Dumb_Question
22.July.2015