Formatting 2tb USB Thumb Drive Advice

I have a 2tb USB 2 thumb drive which I will use to store my photographs and home videos as my belt and braces way of ensuring that I will always have ‘them’ saved in several types of media and locations.
Although I have started I have run into a few problems:-
I was hoping to download large amounts a time, but error messes came up randomly about things like can’t open or other errors, so I really have to attend to be able to respond to the messages.
However, someone suggested formatting the drive differently, I had a look and there are a few options.
File System – NTFS or exFAT (Default)
Allocation of Unit Size – 128KB increasing to 32768KB doubling each step at a time.
Any advice? As it doesn’t mean a lot to me.
Thanks for looking
Dabber
Although I have started I have run into a few problems:-
I was hoping to download large amounts a time, but error messes came up randomly about things like can’t open or other errors, so I really have to attend to be able to respond to the messages.
However, someone suggested formatting the drive differently, I had a look and there are a few options.
File System – NTFS or exFAT (Default)
Allocation of Unit Size – 128KB increasing to 32768KB doubling each step at a time.
Any advice? As it doesn’t mean a lot to me.
Thanks for looking
Dabber