dual boot on two hard drives: can't access secondary hd through BIOS

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http://askubuntu.com – I installed Ubuntu today for the first time on a Dell desktop running Windows XP sp3. I opted to install on a second hard drive, following these instructions: http://www.linuxbsdos.com/2012/07/23/dual-boot-ubuntu-12-04-and-windows-... When I reboot my computer, and enter the boot sequence menu in BIOS, there isn't even an entry for my second hard drive. Every option I select just results in XP booting, and the drive is not recognizable there either, which I expected. I know the hard drive is working. I've been using it on this computer for months previous to (HowTos)