Disk 1 looks odd to me, too. It's reporting a drive size, then two partitions that add to more than the driv4e size.
No, it's kosher - one partition is in MB, the other in GB, the 9MB discrepancy is just a rounding up or down somewhere.
Keef, the difference in your system is that your Disk 2 has no System Reserved partition -the System partition is on the C: drive instead, which is the exception rather than the norm for a Vista / Win 7 installation.
SD