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I currently have the hard drive from my macbook hooked up to my desktop via usb. The macbook hard drive shows up in disk utility but not on the desktop. When I verify and repair I get an "invalid b-tree node size". As a result I have bought diskwarrior to fix this problem. However when I try to open diskwarrior it says "diskwarrior cannot currently be run from this disk because mac os x ignores ownership of some disks by default." So, how do I get diskwarrior running so that I can fix this "invalid b-tree node size" and recover the data from my macbook hard drive?