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Message: <blockquote data-quote="chscag" data-source="post: 1199281" data-attributes="member: 46727">That part is not very clear.  Converting partition tables is not the same as reformatting, however, the way they state it, one can gather that are they're changing the format also.  I would email them to find out for sure.Yes, with iPartition you can create additional partitions without data loss but it will require resizing and the moving of the original partition boundary first.  It will again do that without data loss.That's going to be a challenge.  I'm not sure you can do it without that small 200 MB EFI partition being created.  If you have an old drive laying around that you don't mind messing over, do some experimenting with Disk Utility to see if you can eliminate creating the EFI partition.</blockquote>