Disk Utility won't format free space on startup disk

[peeteeonyou]

On a ProBook 4540s. Everything else has been working relatively fine. Disk Utility, however, will refuse to format empty space on my hard drive, that was earlier used to run Windows 8.1.

This is what happens: http://youtu.be/cTbZ4Qej-a8

Tried making a UniBeast disk and running Disk Utility from there too, with the same results.

Has anyone faced similar issues? Can anyone help me with this?

 

[RehabMan]

On a ProBook 4540s. Everything else has been working relatively fine. Disk Utility, however, will refuse to format empty space on my hard drive, that was earlier used to run Windows 8.1.

This is what happens: http://youtu.be/cTbZ4Qej-a8

Tried making a UniBeast disk and running Disk Utility from there too, with the same results.

Has anyone faced similar issues? Can anyone help me with this?

Not a desktop. Moved to ProBook Laptop Support.

OS X is not well behaved with disks partitioned by other than OS X Disk Utility, but there are things you can check/do.

See this thread: http://www.tonymacx86.com/multi-booting/133940-mavericks-windows-8-same-drive-without-erasing.html