I added ubuntu to XP to my system having 60 GB harddisk. but somehow MBR currupted and lost 20gb of space. no partion manager could read the space occupied previously by Linux.thru ubuntu partion manager I was able to salvage 25gb of space. problum is that before every window xp boot I have to run ubuntu partion manager thru live disk and format the portion occupied by linux to fat32 then boot from HD to XP. Also thru Linux PM, 20.75gb drive show as occupied by 10.46gb and free 20.74 gb of space. I dont understand.
