External hardrive not workon on MacBook Pro

I own a Seagate FreeAgent GoFlex that is 1TB and have had it for about 3 or 4 years. I used to be able to plug it in and with ease insert files (pictures, music, documents, etc .. basically everything in case my MacBook stops functioning.)
Back in May, I took my external hardrive to my University before I graduated and I could not insert some video files (using another computer, which was a Mac.) Our school's tech expert said it was because my external hardrive is not applicable with Macs. Long story short, I showed him I can do it on my MacBook Pro, then I had to save my video files on a flash drive instead. Anyway.
I want to back up everything incase the MacBook stops working soon (it's six years old.) However, when I put in my external hardrive, I can't change the name of files/folders in the external hardrive nor can I insert anything into the hardrive. Oddly enough, I can drag stuff into my desktop and it will copy a file into my desktop while the same file still stays on my hardrive.
My MacBook Pro is Version 10.9.5 (if it matters) and I have more than 90 GB of free space on my MacBook and have nearly 700 GB of free space on my external hardrive and obviously I'd like to use that. Also, I'd like to use my external hardrive not just on Macs, but all machines in case I need to save large files. I used to be able to do this at one point, especially with a previously owned hardrive (it was Western Digital.)
Anyway, that's all the info. All help would be greatly appreciated.

Chiefsfan212006 wrote:
Back in May, I took my external hardrive to my University before I graduated and I could not insert some video files (using another computer, which was a Mac.) Our school's tech expert said it was because my external hardrive is not applicable with Macs. Long story short, I showed him I can do it on my MacBook Pro, then I had to save my video files on a flash drive instead. Anyway.
I meant to also say that your school's tech expert does not appear to be much of an expert.

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