Choose your desired partition format from the drop down menu, and name your drive as you please.Select your desired drive on the left side.Open Disk Utility by searching it in spot light or opening it from /Applications/Utilities.Back up all your files on the USB drive onto a secure location on your Mac.
Note: Changing partition formats WILL DELETE ALL DATA ON THE DRIVE, so make sure you back up all the data on the drive before you start. Now, let's look at the FAT Table sector size on the drive at offset 0x24. If you need to transfer files between computers of various OSs, I'd recommend ExFAT. Next, I look at the total number of sectors in the FAT32 volume ID: uint32t DskSize 30734336 at offset 0x20 It's the same as Linux reports: thinkpad :: cat /sys/block/sdb/sdb1/size 30734336 This is all within spec of FAT32. I'd recommend the MacOS partition format for it's reliability, but only if you're working in a strictly Mac OS environment. For you to be able to store a file greater than 4GB in size, you'd need to reformat the drive to either ExFAT (file size is limited to 16EB, or 16 BILLION TB) or a MacOS partition format (called HFS plus, file size limited to 8EB, or 8 BILLION TB). FAT32 limits file sizes to 4GB and device sizes to 2TB (or 16 TB for 4 KB sectors). This is a typical partitioning format that is supported by practically all computers (windows, linux and mac os). The drive is most likely formatted as FAT32 system. In your case, the problem is the file system on the drive as opposed to how it is connected to your Mac.
