So basically I have a 400 gb hard drive that has been working fine till yesterday. I think it is a WD drive, it is internal. I have to hard drives in my windows xp. The operating system is on the c drive but I added an internal drive to have more memory and use it mostly just for storage like music, movies etc. Yesterday I went to copy something from my desktop which is on the C drive into the F drive (this is the add-on drive that is not working properly) and it started copying but about half way through I got some errors and than the F drive disappeared from under my computer. I restarted the computer but I got an error stating that this is not drive plugged in to SATA 2, which was the location of the F drive. After a while passed I restarted the computer again but this time it would load without an error but once it gets past the windows booting screen the screen would go blank and nothing will happen. I've ran the computers hard drive diagnostics and on the WD hard drive it just says fail but all the other drives and the cd-roms load fine. The computer starts up fine with the F drive disconnected. Could it be that the F drive crashed and is lost? Any help would be greatly appreciated.