Some of my Macs will write to external hard drives but one will not. Why?

Greetings,
I hope the community can assist me with the problem I am having with one of my Macs... so thanks ahead of time for your time in answering and helping me to solve this dilemma!
Here is the problem, I have four Macs at work. We utilize them for making videos and for doing graphic design. One of them is newer (bought last Fall) and has never worked with external drives or even flash drives. It wasn't a problem until recently when we have had a larger staff and actually used it daily for videos. We need to caption the videos on a PC but didn't have a way to transfer them to the PC.. We're using Google Drive to do so right now but it is time consuming and quite impractical. So... why doesn't this particular Mac write to external drives?
Here are the specs on all the Macs, oldest to newest (those that are fine with external drives and the one that hates them):
Likes drives (both reads and writes to them):
1. MacBook Pro, Mac OS X 10.6.8, 2.66 GHz Intel Core 2 Due, 4GB 1067 MHz DDR3
2. MacBook Pro, Mac OS X 10.7.5, 2.2 GHz Intel Core i7, 8GB 1333 MHz DDR3
3. Mac Mini, OS X 10.9.2, 2.3 GHz Intel Core i5, 4GB 1333 MHz DDR3
Hates drives (reads them but will not write to them):
1. MacBook Pro, OS X 10.9.2, 2.3 GHz Intel Core i7, 8GB 1600 MHz DDR3
I'm wondering if there is some setting that will correct this. I have looked at the security preferences and the file sharing preferences and did not see anything out of the ordinary. All of the Macs that work with the drives have never needed settings/preferences changed to be compatible so I'm unsure what the issue could be.
Thanks again for any input. I truly appreciate assistance so that this particular Mac can stopped being nicknamed "the stubborn one."

Haha, great question.. any and all.
I have external HDDs formatted in various ways - a flash drive that is MS-DOS (FAT32); a partitioned drive to work on PC & Mac that is exfat and MacOS Extended (Journaled), and several Seagate drives that are NTFS. Even though Macs shouldn't read and write to all of these, all three of my other Macs do! I have only reformatted one to partition it and the others have just worked when plugged in or with the Seagate software.

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