Get drive letter of Hard drive

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Hi all,

My application is for windows Vista and XP.
There are more than on Hard drive connected to my machine. I need to get Drive Letters of the Hard drive from which my system is booting.
By using GetLogicalDriveStrings Function I can get the drive letters of all Hard drives. But how can I differentiate that this particular drive letter is the partition name of my booting Hard drive?

The structure of disks are:

disk0(Booting with this)- C D G

disk1- E F H

disk2- I J

I need to get the C,D,G only.



Thanks
Madan