I am unable to expand my Mac's hard disk. diskutility reports this error:
MediaKit reports partition (map) too small
How can I resolve this?
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I am unable to expand my Mac's hard disk.
How can I resolve this? |
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If you start the GParted live cd: http://gparted.sourceforge.net/ On your system it will automatically detect and fix this issue. Best solution I found so far. |
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This blog post was the only way I found to solve it, and it's not for the faint of heart. ;-) http://blog.scottmroberts.com/archives/15 Basically the problem is that the GUID partition table is confused about the size of the drive. The only way to fix it is to purchase a tool that will correct the problem, or to manually correct the problem yourself by issuing commands to Also, you must be able to get a root prompt where the drive you're interested in isn't mounted. (for me, this meant popping in the install disk, booting from it, then quickly pressing Command-S to enter single-user-mode.) |
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I know it is a late response. Now only I faced this issue and I find out this blog INCREASE DISK AND PARTITION SIZE IN OS X. This solved me my issue. I am posting this because this might help someone else I hope. |
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Why not just boot into single user mode? Hold down command+s on boot. Performcheck disk and then mount the drive. Go to Then go to You might just have to remove the |
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Not necessarily a useful answer, but I fixed this problem in Yosemite by using the Repair disk option in Disk Utility. Using OSX in virtualbox, on a virtualbox host, and I changed the dynamic disk size, but OSX wouldn't allow me to resize the partition (with the error in the original question) |
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New in Mavericks apparently, you can boot from the installer media (cd or thumb drive) and use it's disk utility. Steps:
This works because it skips all the cached information about the drive that Jens Erat mentioned in his comment. You might notice that around step 5/6 disk utility will take some time to analyze your disk, which it doesn't do when you've booted normally. That's a good thing. By the way, this does not work in recovery mode. Recovery Mode looks very similar to the booting from the install media. But recovery mode still boots off of the harddrive you're trying to repartition, and that causes problems. (Thanks to Dennis at my job for helping me figure this out) |
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