Welcome to the forum!
Honestly, I’d transfer all the pics onto your PC first, though it’s a long process, and put them into folders. Keep the folders about 4 GB in size, so you won’t be burning too close to the edge of the DVD, and burn away.
However…if these photos are important to you, you may like to consider making at least two DVD copies onto different brands of disc (I’d recommend one of the brands to be Verbatim).
As I said, I know it’s a long process, but I do the same and it’s worth it in the end.