If you wonder how this witchcraft is achieved:

disks are "hard sectored" more or less like older style hard disks and floppies were. This essentially turns the DVD-RAM disk into thousands of individually addressable "mini rewritable dvds"

The DVD drive can easily find the correct little bit of the disk to erase and overwrite.

This is how the disk can appear like any normal block device!

A really weird fact: DVD-RAM is predates DVD-RW or DVD+RW!

0

If you have a fediverse account, you can quote this note from your own instance. Search https://mastodon.tmm.cx/users/hp/statuses/116030392415704369 on your instance and quote it. (Note that quoting is not supported in Mastodon.)