I'm running Vista Home Premium. I have a laptop with a 300 Gb HDD. If I right click properties it only shows up as 211 Gb. If I got to Disk Mgmt it shows up as 232 Gb - 211 Gb in my main C Drive, NTFS Healthy (System, Boot, Page File, Active, Crash Dump, Primary Partition); 10 Gb more Healthy (Primary Partition), with no assigned drive letter; 9.5 Gb (Unallocated); and another 1.5 Gb Healthy (EISA Configuration).
If I right click my external 1 Tb Drive, it shows up in properties as 931 Gb. In Disk Mgmt it also shows up as 931 Gb NTFS Healthy (Primary Partition - assigned drive letter E.
In reading previous posts here, there seems to be a lot of mention of installing SP 3 in order for Win to recognize the drives. In Control Panel > System I show SP 2 only. Am I even heading down the right path with this? Any help appreciated.