It's an ECS K7S5a board
http://www.ecsusa.com/products/k7s5a_v3.html
All of the drives worked fine for a long time. I've tried cycling in a third IDE cable, but still no luck.
Each of the drives works at one point or another, but I just can't have both controllers running two devices each.
I can't recall when this first started, so I can't tell you if I did anything.
the drives are all fairly new. Two WD disks, an 80 and a 120 GB. and a 20GB maxtor, which have all been working fine. the CDRW is a LiteOn 40x12x48
When I have three devices running, it'll be fine, but when I shut down and plug in the second device on the cable that has only one device, and boot up, it'll fail to recognize the entire cable.
I've been trying different combinations of 1 and 2 devices on the various controllers, and combinations of the two, but can only see that pattern arising.
The bios is set to auto recognize the devices, and the drives are all on Cable Select.
The weird thing is, this config has been working fine for months, without a single problem. I have a feeling it's one of the controllers, because of the fact that I can repeat the results so readily.
For me, it's a real head scratcher, and more annoying than anything else.