Fedora :: Can't Delete Certain Files From A Mac Drive?

I am using FC11 and have an external USB drive attached which was originally formatted and used with OS X. I'm pretty sure it's an HFS+ filesystem, but fdisk-l simply reports "unknown". I moved a ton of files to it from an older OS X drive, including a bunch of backups that were done with Time Machine in OS X.

Now I've moved them all back to where I want them (onto an EXT2 formatted drive) and I'm trying to clear those Time Machine files off the HFS+. The drive will ultimately be used with a Mac, so I don't want to wipe the whole disk (aside from the fact I have a ton of other stuff on there that I don't want to move).

The problem is that I cannot get FC11 to delete the Time Machine files. When I try to delete the top level folder ('rm -rf topfolder'), the command looks like it's running (and goes load crazy on the CPU), but I left it running all night, then cancelled it this morning, no files were deleted. It just sits there. When I try to delete folders a little lower in the tree using 'rm -rf myfolder' I get an error telling me the folder is not empty. When I go down to the lowest level folder, I can only find DS_Store and .localized files in it. The properties are rather odd... output of ls -als is this:

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