Summary - I have a 1.85TB DMG that is uncompressed and unencrypted. I'd like to essentially remove the DMG wrapper and make the contents accessible as files and folders on the same disk -- but without copying the content out of the mounted DMG and onto the same disk. Details - My 1.85TB media drive (the entire drive is 2TB, but a small part is partitioned for Time Machine backups -- I'm not concerned with that partition) started showing signs of impending failure after I returned home after the holidays (I guess it didn't like traveling). The drive wasn't backed up, because the data isn't important enough to warrant the extra time/expense/hassle involved. If I lose it all the world won't end, but I'm still willing to put in some work to save as much as possible. I'm currently using ddrescue to create a DMG of the failing drive on a new 3TB external drive that I purchased as a replacement last night. Thus far it's about 200GB in, without any errors. Fingers crossed! I'm assuming for purposes of this question that the final DMG won't have any errors -- if it does, that'll change things, of course. When ddrescue has finished creating the DMG, I'll have a 1.85TB DMG on a 3TB drive. That 3TB drive will become my new media drive, so I'll need all of the files be stored in the DMG accessible as individual files/folders. I know I can mount the DMG and copy the files from the image to the new media drive. But, I figure that'll be especially slow, since it'll be copying from and to the same physical hard drive. Also, I'll end up with about 700GB of data that I can't fit on the new media drive until I've erased the DMG. I don't have enough hard drive space available to temporarily put all 1.85TBs on a third drive (if I did I'd be using three HDDs in this process, and wouldn't have to ask this question). Although I could probably stash the extra 700GB onto separate drives temporarily, before deleting the 1.85TB DMG, thus freeing up room to copy the 700GB back to the new media drive. Still, that would be slow and a hassle as well. So, what I'd --really-- like to do is just convert the DMG into its component files and folders automatically and without copying -- simply by changing the way the OS refers to the content. I know that wouldn't work if the DMG were compressed or encrypted, but so far as I'm aware ddrescue is outputting a 1:1 copy of the original disk, so it should -- at least in theory -- be possible to make the change. That said, I haven't been able to find any info on doing such a thing with the usual forum and Google searches, so I suspect it's not possible. But I didn't find anything saying it can't be done either, so I figured I'd ask the experts. Many thanks for the help! EDIT: Forgot to mention - this is being done on an Early 2009 Mac Mini running Snow Leopard 10.8.5. Both external drives are USB 2.0.