This procedure not only removes the drive's partition, but also removes the Drive Signature.
Mac OS Extended (Journaled), Mac OS Extended (Case-sensitive, Journaled), MS-DOS (FAT), or ExFAT and click “Apply”.The GUID Partition Table (GPT) provides a more flexible way for partitioning disks than the older Master Boot Record (MBR) partitioning scheme that was common to computers. Choose the partition layout, enter the desired size of the partition(s), and rename the partition(s) if desired.GUID (GPT), Apple Partition Map, or Master Boot Record (MBR). Click Options and select the partition scheme.Select the drive to initialize on the left.Open the Disk Utility located within the Utilities folder inside of Applications.After clicking “New Simple Volume” complete the “New Simple Volume Wizard” to format and assign a drive letter.Right-click on the unallocated space, and select “New Simple Volume”.Select either Master Boot Record (MBR) or GUID Partition Table (GPT).The Disk Management Console should automatically detect a new non-initialized drive ask to initialize it.
We’ll cover the most common scenarios we run into, starting with Windows and finishing with Mac OS X instructions. Initializing prepares the drive to be used by the computer, partitioning sets aside specific areas of the disk for data, and formatting sets up the framework the computer uses to store that data.