On my 2011 MacBook Air with Mac OS X Lion, I boot into Recovery mode via holding the command-R key during startup, if I go into Terminal and do a diskutil list, I get a list of 12(!) logical disks.disk0 is of course the disk holding the main HD and the Recovery HD partitions (along with the GUID partition and the EFI partition). Photo management for mac os x. But there is also a disk1 with partitions including one titled.

Someone

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please correct me if I'm wrong, but I don't think it's possible to resize partitions without losing the information on them.

I came up with a procedure similar to the above back when I was juggling partitions between OS 9, Mac OS X Server 1.x, and LinuxPPC. There is a port of pdisk that works under OS 9, and I used it with great success, without even booting off the CD-ROM. (It would modify the tables of the booted partition, but the changes would only become active when you rebooted.)

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pdisk works great for wiping & redefining partitions, but it's not cut out to resize or move existing partitions without data loss. That's one of the things I miss from my past life on the PC.. PowerQuest's Partition Magic. That thing would resize, move, consolidate, slice, dice partitions on a PC like nothing else. Too bad they're not in the Mac market. (I actually know an engineer there, and tried to talk him into a Mac port, but I was starting on the wrong end of the management chain. ;-)

Once I foolishly tried to 'consolidate' two contiguous HFS+ partitions (using pdisk - delete the second partition and resize the first one to take up all the space) while retaining the data on the first one. It really hosed things. I had to run every disk utility I could get my hands on several times each before the partition would mount, and if my memory serves, it never worked completely (without errors) again until I reformatted it.

I've looked at several HFS+ disk utilities, and though I found one that claimed to do partition resizing for (legacy) HFS disks without data loss, nothing I found would work for HFS+. It's been a couple years since I researched it, though, so maybe there are more options now.

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