I'm trying to install Ubuntu 12.04 32-bit from a USB pen drive. I have two drives, a WD Caviar Black and a Samsung SPC250. At the "installation type" stage, it only sees my Samsung and the USB pen drive, not the WD. I checked the drive with gparted and everything seems fine. I tried the alternate installer but that doesn't work either I tried changing from IDE to AHCI in the BIOS and back What can I do now?