Many times Disk Utility shows error like (disk can’t be partitioned, disk couldn’t mount, disk partition failed etc.) while partitioning Mac hard drive. Users try to partition Macintosh drive by booting into safe mode, booting into single user mode along with commands but often gets no results. If you are facing the same type of Mac drive partitioning issues then scroll down to see different cases with their solutions and enjoy working with Mac.
Case 1: Unable to
Resize
Suppose there is Mac drive with two partitions. One partition
has OS X 10.7 and another OS X 10.8. Over a period of time, if partition2 (i.e.
partition installed with OS X 10.8) needs to get resized (making partition larger
in size) but Disk Utility is not allowing so even there is empty space
available after partition2.
- The reason behind this situation is Disk Utility allows for partitioning Mac drive from the end corner point rather the starting point. If this type of the situation made you stuck in mid of the way then try to boot Mac system into Recovery HD partition (by pressing and holding command–R together at startup time and release the keys once you hear chimes sound) and use Disk Utility to resize disk partition. Please make a backup copy (bootable clone of Mac drive or an image) of complete Mac system before proceeding further.
- If the above solution doesn’t work for resizing Mac drive partition2 then try to make an image of this partition firstly either with Time Machine or third party Mac drive cloning software. Then delete partition2. Now, create a new partition with GUID file type and restore the complete data back from that image created earlier. Open Disk Utility, click on the image and point it to newly created partition.
3:08 AM - By Stuart Bell
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