Windows 8 with multiple hard drives

Hi. I just tried installing Windows 8 on my HP Elitebook 8440p. I have an extra hard drive instead of a CD drive in the upgrade bay (only used for data, the OS is on the standard internal HD which is partioned in three parts). First I got the well-documented we can't find a partition bla bla bla error". I tried swapping the extra hard drive for the standard cd drive. Now Win8 installed like a...