Hardrive Size Problem

[DJSUB]

Does anyody know how i can return back the size of my 30gb laptop hardrive to it's normal size, because before i remove the old FAT32 file system on that drive, the size of my drive is 28gb on Windows XP, but when i remove the file system on dos & make a new FAT32 file system & format it on my laptop computer the size of my hardrive became 7.79gb but when i tried to format it inside windows xp using FAT32 or NTFS file system, It didnt return back to normal size. is there any good software that can bring back my harddrive partition to it's normal size?

Please Help


THANKS IN ADVANCE