Windows 7 - hard drive issue

Hey guys, I have a fellow member on another forum that has a harddrive issue. Here is his situation. Any ideas.

I just installed Windows 7 on my PC. I had been using Windows Vista Ultimate (32 bit) and upgraded to Windows 7 RC (32 bit). I wanted to use a 64 bit OS, so I wiped the HDD which had Windows 7 RC on it to do a clean install of the full version of Windows 7 Ultimate. At first, it wouldn't install on my HDD and wouldn't show my other 350 GB storage HDD. I unplugged the storage HDD and finally it allowed me to install on my OS HDD. After I plugged the storage drive back in, it will only display as 127 GB. It also says it's empty, when I had quite a bit of media files on it. I'm not exactly sure what the problem is.
I've checked the Bios

and the HDD option for my storage drive is selected as "auto" (other choices include LBA, Large, and C??). I'm not sure what gives. I have updated all the drivers that I could find in relation to this problem, but have not performed an update to the bios as it appears to have the proper options available and worked with my previous system.

My two HDD are:

70 GB WD Raptor (Ibelieve this is not a typical IDE drive)
350 GB Maxtor IDE

Everything worked fine with both Vista and Windows 7 RC, and I'm just experiecing this problem with 7 Ultimate.

The BIOS update might be needed, but has he checked what the permissions and ownership are on the data drive?