I bought macbook pro 13 inch with OS X lion couple of days before. I triple partitioned it using rEFIt. I installed windows XP in one of them and it was working fine until I got to the point where I need to install drivers for XP (at that point, I didn't know that the drivers should be downloaded from server). From the boot camp assistant, I have downloaded the drivers not before formatting the windows XP. After downloading the drivers and burn into to the disc, I again triple partitioned the mac HD using rEFIt (windows xp -50 GB, Ubuntu - 40 GB and rest for Mac OS X Lion). No problem shows up during the partition. After installing the windows XP and restarted the macbook pro, to my surprise there is only one HD showed up and that is windows XP. I logged into the windows xp to check the drive capacity. The 'C' drive's size is around less than 50 GB and it s pretty clear that the windows XP is installed in the correct partition. But Where is the mac os partition ?. Its missing. I think, the mac os is not erased and it should be there. how to get that back? Thanks,.