I've been currently using a 600gb SATA HDD for my OS etc and everything else. I decided to put in my other SATA 320gb HDD as I am going to need more space (Recording with my hd capture card takes up alot of space!). I put it into the HDD bay, plugged both the SATA cable and power cable into it. I turned on my PC and it read it and said it was set to go. I went into Computer Management to set it up and a window popped up saying I needed to initialize Disk 1 being the drive, so I clicked ok. It freezes for a second and then a small box pops up saying "The request could not be performed because of an I/O device error." Please help, I am very smart with computers for the main concept however HDDs are actually one of the only things I'm not very experienced with. Thanks guys! I appreciate any support. I am using Windows 7 64 bit OS in case that matters.