Hello there I recently bought an external HDD for my MacBook Pro because it is only a 256GB model so it doesn't have a lot of space. I read online that I can use the external HDD not only as a Time Machine drive, but also for general file storage. I tried following the methods posted about formatting the drive as Mac OS Extended (Journaled) and then partitioning it into two partitions, but I am unable to do that. Please check the screenshot attached for reference. I am currently reading on how to convert an external HDD from MBR to GUID, but is that the answer to this? Thanks for your time.