Windows 7 HDD And Partition Configuration?

I put the XP disk in to have a look at the partitions before deleting them, but found the partition screen was confusing. My query is as follows:

2)There are 2 HDDs in the PC. When I got the PC, it had one Seagate HDD - W7 appeared in Windows on the C: drive and I placed applications there. Immediately afterwards I added a 2nd Hitachi HDD to hold data only, creating a single volume on it called G: data drive. This all seemed to be working fine until this current problem.

3) So, I thought I would see a C: �system� partition, or maybe a 100MB �system reserve� C: and another lettered part of that partition, and the G: partition/volume for data files (on the second HDD). However, what I saw on the partition screen via the XP installation disk was this:

476938 MB Disk 0 at Id 0 on bus 0 on atapi [MBR] D: Partition1 (System Rese) [NTFS] 100 MB ( 75 MB free)
E: Partition2 [NTFS] 476838 MB ( 419213 MB free) 476938 MB Disk 0 at Id 0 on bus 0 on atapi [MBR] C: Partition1 (data drive) [NTFS] 476937 MB ( 383546 MB free)

4) In the CMOS Features screen in the BIOS setup, the HDDs were configured like this (extract):

IDE Channel 0 Master [None]
IDE Channel 0 Slave [None]
IDE Channel 1 Master [Hitachi HDP725050GLA]
IDE Channel 1 Slave [None]
IDE Channel 2 Master [None]
IDE Channel 3 Master [None]
IDE Channel 4 Master [ST3500413AS]
IDE Channel 4 Slave [None]
IDE Channel 5 Master [Optiarc DVD RW AD-72]

The Hitachi HDD at channel 1 is the 2nd HDD, added by me after delivery to hold data files only, so I expected to see it below the Seagate HDD on this list.

5) Also, the Hitachi HDD was top of the Hard Disk Priority list on the BIOS Advanced screen. Again I would have expected to see the Seagate above the Hitachi in that list.