I have 2 hard drives. Windows installed on one and suse linux on another. I go into my BIOS to startup with one or the other. Is there a way to combine both on one drive without having to repartition and delete windows and re installing both? windows uses 100% of the first HD, linux uses 100% of the second.

If it's just an easier way of dual booting (rather than editing BIOS settings every time), try searching the internet for something like:
grub dual boot linux windows

But to answer your original question, you could try to move both to a new, large disk (the dd command in linux might be appropriate). This would probably be easiest if you made the partitions on the new disk the same size as on the old disks. This sound to me like a royal pain to me tho, and IMHO, your life would be much easier if you set up dual booting with grub.

Some things to keep in mind:
- Windows needs to be on an active partition of the first disk (C: in DOS, hda or sda in linux)

I've seen an easy way where you create a very small (2M is plenty) primary partition on the Windows disk, and install grub there, pointing it back to the Windows installation, which you don't have to touch. Otherwise you can change the MBR (master boot record) of the Windows disk, where Windows boots from now.

Plenty on the internet on this subject...