I have purchased a Sabrent ATA-133 controller card to attach 2 more PATA Western Digital 80GB hard drives. When both are attached to the primary slot, the computer freezes upon windows booting after the desktop appears. I can attach both to the secondary slot, or use 2 cables and put 1 on each shot and it works fine. I have tried using CS as well as master/slave settings too and it doesn't make a difference.
I came across a cheap Adaptec controller card so I thought I'd try it instead of the Sabrent. The computer boots fine but every 1-2 minutes I get a 2 second freeze of the computer - mouse and any application that is running freezes for a couple seconds. I found this behavior only occurs on the primary channel. If I move the drives to the secondary channel it works fine.
Why am I having this problem with both cards on the primary channel? It is sharing IRQ 18 with PCI-e root port and a USB host controller, but this is the same no matter which channel the cable is attached.
I have tried different cables and changed which hard drive is the master and slave, still nothing.