|"But with DVD etc nowadays files are going to be bigger than 4GB so maybe that's why he wants to change"|
We have no idea why he wants to change, that's why we asked.
And although a DVD can hold over 4GB of data, rarely is it a single 4GB+ file. I just popped in a retail movie DVD I had nearby & the disc contains 7.57GB. I opened explorer, sorted by size & the largest file on the disc is 0.99GB.