During OS install in a new system you are given partitioning options.
The system displays the total amount of HDD memory available in the unpartitioned format - you proceed by partitioning this total HDD memory into smaller fragments in the way you deem fit.
For me the system showed : 57232 MB Unpartitioned Space
I started with the 7232 MB : 7232 MB C: OS and System
and 5 drives of 10000 MB : 10000 MB D: Applications
: 10000 MB E: Programming Tools
: 10000 MB F: Media Files
: 10000 MB G: Games
: 10000 MB H: General Data
This lets me organize stuff more efficiently.
This is how things are as of now.What happened the first time :-
I started with 7232, 10000, 10000, 10000, 10000 and then did not allocate the last 10000 - as a result of which I did not have the H: and lost that 10GB of space - never showed up in the windows "My Computer".
So I began the tedious process of installing the OS again. I am sure there must have been some other way but hey - I am stupid
Hope this clarifies everything...