Comment 13 for bug 158166

This is a problem for quite a few people on the Apple Intel Forum. Seems most have Samsung Harddrives.

There is a trick to making a disk in normal MBR (msdos) partitioning, and still get osx on there, might try reformatting the disk in a 'msdos' format. To get OSX on there, you will have to install normally, then use something like Carbon Copy Cloner to clone the partition to an external drive. Then you can format the internal drive however you like (with an HFS+ partition) and clone the osx image back onto the msdos disk.