I have an iMac with OS X.6.8, one HFS+ partition. Yesterday, I wanted to install Win7 using bootcamp. Bootcamp gave me an error message saying the disc cannot be partioned or resized. I CAN however, partition or resize using Disk Utility (my hfs+ partition is GUID). Using Partition inspector gave the following report : *** Report for internal hard disk *** Current GPT partition table: # Start LBA End LBA Type 1 409640 624880303 Mac OS X HFS+ Current MBR partition table: # A Start LBA End LBA Type 1 1 625142447 ee EFI Protective MBR contents: Boot Code: GRUB Partition at LBA 409640: Boot Code: None File System: HFS Extended (HFS+) Listed in GPT as partition 1, type Mac OS X HFS+ Now, I have installed Ubuntu using rEFIt a couple of months ago, but I erased everything and went back to one HFS+ mac os X partition. But maybe some files weren't completely wiped (the GRUB thingy in the report gives it away, I think). Now, I could wipe my drive, reformat and reinstall everything and use my TM-backup to put all my apps and files back, but that's a bit drastic. Also, I used iDefrag (demo) to check my drive and apparently, it's heavily fragmented. Any ideas ?