An error occurred while partitioning the disk

I had been trying to instal windows 8 Pro to iMac 21.5 OSX10.8.5 but when i tried to partition the disk it prompts an error occurred while partitioning the disk. I tried to verify and repair the disk but it says ok. What should i do? thanks in advance

iMac, OS X Mountain Lion (10.8.5)

Posted on Aug 21, 2015 2:08 AM

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10 replies

Aug 21, 2015 5:35 AM in response to louiefromquezon city

1. Try safe mode if your Mac doesn't finish starting up - Apple Support and boot back normally and test BC Assistant again.

2. Resolve startup issues and perform disk maintenance with Disk Utility and fsck - Apple Support and boot normally and test BCA again.

3. Try the following two steps and then try BCA.

Resetting the System Management Controller (SMC) on your Mac - Apple Support

How to Reset NVRAM on your Mac - Apple Support

4. If none of the above work then

a. Back up OSX using Time Machine - Mac Basics: Time Machine backs up your Mac - Apple Support.

b. Boot into Internet Recovery - OS X: About OS X Recovery - Apple Support.

c. Erase your internal drive and restore from the TM backup in Step 4a - OS X Yosemite: Recover your entire system.


Please be aware that TM does not backup Bootcamp partitions.

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An error occurred while partitioning the disk

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