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Nov 8, 2015 11:40 PM in response to Csound1by holoski,thank you. It seems to be an issue I can't add a partition on the drive called "internal drive" I can't select the + button , nor indeed any button on that tab. I run first aid and verify disk and repair disk indicate the drive is okay.
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Nov 9, 2015 1:33 AM in response to Csound1by holoski,Just to confirm, I don't need keep any data, the whole point is to scrub it clean and do a clean reinstall. Someone suggested separating the fusion drive and reformatting each drive and recreating them. No idea if that is valid.
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Nov 9, 2015 2:13 AM in response to holoskiby holoski,I think this may have solved it, as I am currently able to use the internet recovery to reload Mavericks, which is currently downloading. Fingers crossed.
The way to deal with this is by separating the fusion drive, reformatting each drive, and recreating them. I suspect what's happened is your Mac cannot recognize the NTFS formatted portion of the disk.
Reboot while holding Alt + Cmd + R for Internet Recovery Mode. Go to Utilities > Terminal, and in terminal type: diskutil cs list, then find the UUID under "Logical Volume Group" with the missing space, copy it, and paste it after: diskutil cs delete. Go back to Disk Utility. At the prompt, click "OK" to repair your Fusion Drive. Exit Disk Utility, reboot (to the recovery partition if it doesn't automatically, to Internet Recovery Mode, or using a recovery USB drive) and reinstall OS X.
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