I have 3 in all.
To save any hastles with linux [censored] up my windows install i disconnected the other 2 drives that have my data and windows install on them and just left the 1 160gb HDD that i wanted to install linux onto.
But when the installer went to format the drive and make its partitions.. it failed.
Error was along the lines of the drive was busy/in use.
even pressing ctrl+alt+f2 and trying fdisk to set the partitions failed.
I have run tests on the drive and all is fine with it