#2 Format a drive, USB thumb drive etc., to work with Mac or a PC, on a PC. Open Disk Utility and select the drive makers name and size on the far left, then Partition: Options: GUID partition table and Format: OS X Extended (Journaled) name it and click Apply. #1 If you want to format a drive, USB Thumb drive etc., to only work with a recent Mac and to boot OS X with So make sure you have a copy of the data off the drive your attempting to change and physically disconnect all other non-essential drives so no mistakes occur. Whenever you changing the drive, there is the potential for the lost of data. I will explain to you just the basics how storage drives operate in regards to different operating systems, formatting and partitions, especially sharing data with Windows PC's which is the most common asked about issue.įor simplicity sake, I have stuck to the most current used formats and steps on Mac's and PC's that your likely to encounter and encouraged to use now.