Q: The startup disk cannot be partitioned or restored to a single partition.
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Mar 17, 2016 8:39 AMby sterling r,Hi there Nikul.Patel,
If I understand correctly you are trying to merge your old Boot Camp partition into your Mac OS partition but this error is preventing you. Take a look at this article because it mentions the same error message and seems to be specifically for your issue here:
Boot Camp: Partition alert message when using Boot Camp Assistant
CLOS
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Mar 17, 2016 4:46 PMby Loner T,The simplest and safest method to get your disk corrected is to
1. Backup OSX and all your files - Use Time Machine to back up or restore your Mac - Apple Support .
2. Boot into Internet Recovery (Command+Opt+R) - OS X: About OS X Recovery - Apple Support .
3. Click on Utilties -> Disk Utility and Erase your internal whole disk.
4. Restore OSX and your files - Use Time Machine to back up or restore your Mac - Apple Support .
This requires a separate external disk which can accommodate TM backup - Backup disks you can use with Time Machine - Apple Support .
