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<blockquote data-quote="MacInWin" data-source="post: 1938064" data-attributes="member: 396914">Yes. That is a drive failure. And given that the drive isn't even mounting, it's most likely dead. And without mounting it, you don't know how full it is. All you see in Disk Utility is that the hardware is of a certain size and that all of it is allocated to a partition. How much of that partition may be used is not visible. The drive has to be mounted for that information, but with that error failure, it won't mount. It's dead.EDIT: IF you want to try some pretty risky things, do a search on &quot;invalid b tree node size&quot; and there are sites out there that claim to be able to fix the drive. Most of them involve reformatting the drive, which will erase everything on it, so you would lose everything. If you are willing to do that, you might be able to do that from Recovery, where you can get to Disk Utility, select the hardware and then use &quot;Erase&quot; to try again to format it. Again, all will be gone, but if it formats, you can try to reinstall an OS to it to get it functioning, minus the data.</blockquote>

[QUOTE="MacInWin, post: 1938064, member: 396914"] Yes. That is a drive failure. And given that the drive isn't even mounting, it's most likely dead. And without mounting it, you don't know how full it is. All you see in Disk Utility is that the hardware is of a certain size and that all of it is allocated to a partition. How much of that partition may be used is not visible. The drive has to be mounted for that information, but with that error failure, it won't mount. It's dead. EDIT: IF you want to try some pretty risky things, do a search on "invalid b tree node size" and there are sites out there that claim to be able to fix the drive. Most of them involve reformatting the drive, which will erase everything on it, so you would lose everything. If you are willing to do that, you might be able to do that from Recovery, where you can get to Disk Utility, select the hardware and then use "Erase" to try again to format it. Again, all will be gone, but if it formats, you can try to reinstall an OS to it to get it functioning, minus the data. [/QUOTE]

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