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AFPoster

macrumors 68000
Original poster
Jul 14, 2008
1,565
152
Charlotte, NC
I bought a new WD portable HD and when I plug it into my MacBook Air it won't allow me to put anything on it. My friend mentioned I need to go to Disk Utility and format it properly. Does anyone know the correct steps so it works every time?
 
Connect your drive
Start up Disk Utility

WD-20100329-064531.jpg
 
You have to have at least one partition on a disk to make it usable. Click on the Partition tab in Disk Utility. Near the bottom you should see a button labeled Options. Click that and choose GUID.
Save that setting and Type in a name for the new disk. Choose Mac OS Extended (Journaled) as the Format and click Apply (Warning: This will erase any data on the drive.)

If you want more than one Partition on the drive, (each partition will appear as a separate drive to the OS) change the volume scheme to your desired setup.
 
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