3 Replies Latest reply: Oct 25, 2013 10:12 AM by braden85
Robert Lindsley Level 1 (105 points)

Hi there,


I searched but didn't find an answer for this.  Sorry if this has been asked and answered.


I'm trying to install Mavericks on my Macbook Pro  (2.4GHz Intel Core I5 w/8GB RAM and 1TB HDD).  When I download from the Mac App Store and I try to install, I get the following message:


"This disk doesn't use the GUID Partition Table scheme.  Use Disk Utility to change the partition scheme.  Select the disk, choose the Partition tab, select the Volume Scheme and then click Options."


When I go into Disk Utility and select the Partition tab, the options button is greyed out and non-selectable. 


Does anybody have any thoughts on this?  Is it asking me to reformat my HDD to GUID before I install?