disk-utilitymacospartition
I'm having trouble accessing about 50GB of space on my computer after a failed partitioning attempt. Before you ask, I don't know what went wrong, I just know that now, I can only turn the free space into an additional partition. I really just want to be able to resize or edit the partition map, but Disk Utility has other plans in mind. Suggestions? I'm sure I'm not the first person to see something like this.
Lion has a hidden partition which contains recovery information. Shrinking the partition, according to an Apple employee, is not supported. He hooked up my MBP to an external hard drive and wiped and reinstalled Lion in order to fix things.
In more detail, what happens is this: When you try and resize the main partition, it doesn't include the recovery partition. When you hit "Apply Changes," it does a checksum to make sure that nothing's accessing the drive. It then gets started, doing another checksum, and discovers that something's changed, breaking the previous checksum.
Try booting from a USB drive and running Disk Utility from there on your drive, using this method in Disk Utility. You can just slide to resize the partition.
Best Answer
I actually figured it out myself. All I had to do was turn off FileVault and restart the system. Disk Utility works normally now.