H/D Drive dissappeared?

[Clipsey]

My secondary H/D has all of a sudden just dissappeared

I use it purely for all my music and pictured etc (My Documents basically) and then as of this morning it is just not picked up or recognised by the PC -
Me being a nub with this sort of stuff have no idea what to ?

Any ideas ppl?

Thanks and merry xmas

 

[Deiwos]

Checked in the BIOS? checked if its physically connected?

 

[Clipsey]

Yeah it is not being recognised by the PC at all?
Right from the start.

Which is weird is that it started doing this and then restarted a few times and it was back to being there. Now nothing