IDE + SCSI drives in B&W G3

[Mike & Carol Fuller]

I have a rev 2 B&W G3 with 3x9GB scsi drives installed. Because of the 
limitation of running my boot disk on 9GB, and the high cost of larger 
SCSI drives, I want to replace one of the drives with a cheaper IDE 
(attached to the Ultra ATA port).

Are there any problems in doing this, or anything I should be aware of?
Can I use any size IDE drive?

Thanks for your thoughts.

Mike Fuller