“I have recently ungraded to an Intel-based Mac machine, but Mac Lion is not booting now. How can I make my Mac running again? I am not much familiar with its internal utilities. Do I need to delete and rebuild every Mac volume? Somebody please let me know how to do it.”
In addition to all disk-related activities (e.g. disk verify and repair), Disk Utility facilitates you to format Mac hard drive and rebuild Mac volumes safely. However, those who are newbie may not be aware of how to repartition Mac drive. Refer to the scenario discussed above representing a repartitioning issue on dissimilar Mac machines. However, the difference between an Intel-based Mac machine (GPT – GUID Partition Table) and a PowerPC-based Mac machine (APM – Apple Partition Table) is the Partition Map Scheme.
An Intel-based Mac can read/write the data on APM partitions, but cannot boot from it. Similarly, a PowerPC-base Mac can read/write the data on GPT partitions, but cannot boot from it. Therefore, you have to format Mac drive to change the Partition Map Scheme to GPT. Following are quick and safe tips to partition Mac drive after deleting all volumes on an Intel-based Mac machine.
- Attach your hard drive to a running Intel-based Mac machine (or if your Mac machine has multiple hard drives installed on it, boot from another one).
- Launch Disk Utility from Applications/Utilities/Disk Utility.
Select the target hard drive shown in the left pane of the Disk Utility window and simultaneously go to Partition tab in the right pane. Here, under Volume Scheme area, you will see the graphical structure of the Mac drive partitioned into several volumes.
Click a Volume, and then click minus (-) button to delete it. The space freed up after deleting a volume is displayed at the end of last partition. Now, repeat the process for each Mac volume and free up overall memory. This will result in a single partition containing all the space on the drive.
- Click Options button below drive structure, and choose GUID Partition Table as the Partition Map Scheme.
- Now, in the dropdown list under Volume Scheme area, choose how many partitions you need to create on the Mac drive. If you select 4 partitions, the drive memory will be divided into 4 partitions of equal sizes. However, you can resize them again.
- Specify a name and choose a format for every Mac volume individually. After the partitions are created, click Apply to save the modifications done so far. Click Partition button on the message displayed. After the processing is finished, a new drive will be displayed on the desktop.
- Now, run Mac boot disc and install OS X on any of the volumes.
After the installation is finished, boot from this drive on your Intel-based Mac.