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SSD disk wont partition, erase in OSX - error 69888 couldnt unmount disk [migrated]

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http://serverfault.com – I erased the SSD drive in my macbook and was reinstalling lion when it failed about 75% through the install. Now in the disk utility, sometimes I see the SSD drive and sometimes I boot and it's not there but I can never erase or partition it. I get an "error 6988 couldnt unmount disk". When I attempt to run fdisk to correct the MBR, it doesn't do anything. Any ideas how to fix a disk that is severy screwed? -bash-3.2# diskutil list /dev/disk0 #: TYPE NAME SIZE IDENTIFIER 0: *64.0 GB disk (HowTos)