Unable to format my WD Ext HD


Just purchased a WD Passport Essential 320GB Ext HD for my Mac.

I have recently updated my OSX 10.9.4 Mavericks.

I don’t seem to be able to reformat the Ext HD as there is no Mavericks installation software.

Please does anyone have any step by step guides to reformating for Mavericks?

Many thanks,


Take a look a this link:

How to partition and format a WD drive on Windows (8, 7, Vista, XP) and Mac OSX

1 Like


Thanks for the information.

After much faffing around I have managed to reformat the EHD for my Mac.

Thanks for your support!