> Splitting the file doesn’t need to be part of the file format itself. I could split a file into N parts, then concatenate the parts together at a later time,

> Splitting the file doesn’t need to be part of the file format itself. I could split a file into N parts, then concatenate the parts together at a later time, regardless of what is actually in the file. I'm inclined to agree with you. You can see good examples of this with the various multi-part upload APIs used by cloud object storage platforms like S3. There's nothing particularly fancy about it. Each part is individually retry-able, with checksumming of parts and the whole, so you get nice and reliable approaches. On the *nix side, you can just run split over a file, to the desired size, and you can just cat all the parts together, super simple. It would be simple to have a CLI or full UI tool that would handle the pause between `cat`s as you swapped in and out various media, if we hark back to the zip archive across floppy disks days.