I had the same problem. I run two ide HDD's (Maxtor 100 gb, 200 gb) in mobile docks with my Abit VT7 mb. I decided to utilize the sata ports with a new sata HDD (Seagate 500 gb) after my 40 gb ide stoped working recently (was in a 3rd mobile dock I use to swap back and forth for backup). I installed and powered up the new Seagate 500 gb sata HDD and nothing, it couldn't be seen.
My windows XP disc couldn't even find it either when I re-booted from it as the Seagate instructions say to do. Finally I looked in the windows control panel - device manager under disc drives. The new 500 gb Seagate HDD was there.
I then decided to go to a Maxtor ide program I have on my computer, Maxtor Maxblast 4 (obtained when I bought my previous Maxtor ide HDD's). I opened it and Maxblast found the new Seagate 500 gb drive, so I cloned over the new Seagate from my 100 gb Maxtor ide HDD. Next time I booted, the new Seagate sata drive showed up in my explorer tree. I could then even change the bios (hit del on startup) and after I changed the boot sequence in the bios, I could boot directly from the new Seagate sata drive.
I had tried the Seagate methods that came with my new 500 gb sata HDD, boot from the Windows XP disc, hit F-6 when prompted, etc. , didn't work at all.
I'm not at all an expert in this. I had many mis-starts as I stumbled through this before I found my way into figuring out how to run both sata and ide HDD's on the same Abit VT7 computer motherboard.
I also had to check the following:
1) Abit bios, latest version (v-14) was on my computer. (wasn't, but was easy to flash from Abit's download site.)
2) Sata raid drivers from my motherboard disc loaded. (I clicked on and did the update drivers routine.)
Everyone reading, send me $10 for this instructional help, k?