I got a hard drive from my brother, he had been using it in raid 0, but one of the hard drives failed, it was in an older system he didn't need so he gave me the computer, after installing the HD and reformatting it on my system, it still shows the missing volume from the other HD, it's 120 gigs; but showing as 240 gigs with 120 gigs unavailable, any advice on fixing this? Will it be safe to put programs on this drive if I don't fix it?