How to read GPT drive in Mac?
The first step in situations like this is to use the mouse to select each visible part of the drive on the left and use the info button.

It will show you things that the command tool diskutil will if you open terminal and use it:

diskutil list


That will read the volume partition map and give you details on each partition with less detail than the info pane in disk utility. Once you know if the other partitions are NTFS or ext3 or another format, you can look for software or drivers to read that content. Worst case you have to pay for a commercial solution if you can't change the disk to a format that OS X reads (or writes if that is your requirement) natively.

Since Apple supports a wide variety of filesystems in read only mode, the most logical conclusion would be your drive isn't following standards or is damaged slightly and would mount properly once repaired or reformatted to standards. It's not uncommon for vendors to implement slight variations to filesystems that break compatibility on other OS.


https://developer.apple.com/library/mac/documentation/FileManagement/Conceptual/FileSystemProgrammingGuide/FileSystemDetails/FileSystemDetails.html