formatting/partitioning hard drive

[alyssamcgilvery]

hi I have a segate expansion portable hard drive 4TB, which I need formatted into MS-DOS(FAT)
I have tried formatting but it is saying I only have 1.8TB available (should be 4TB),
I think it may have a partition? (see image) is it possible to have one 4TB partition?
if not how do I make another? or more importantly how do I access the other 2.2TB?
when I try and make a partition some of the options are greyed out (see image)

thank you in advance

 

[chabig]

The maximum partition size on a FAT32 file system is 2TB. To use the entire space you can create multiple partitions or use a different file system. I think the options are grayed out because they represent an impossible option. Try converting that single partition into HFS. Then change that into two HFS partitions, and ease them as FAT. Or use ExFAT, which extends FAT32 limits.