FreeBSD DVD 64 bit for amd64 aka X86_64
SHA512 hash of the ISO:
326c7a07a393972d3fcd47deaa08e2b932d9298d96e9b4f63a17a2730f93384abc5feb1f511436dc91fcc8b6f56ed25b43dc91d9cdfc700d2655f7e35420d494
SHA512 hash from this page on the FreeBSD website:
https://www.freebsd.org/releases/13.1R/checksums/CHECKSUM.SHA512-FreeBSD-13.1-RELEASE-amd64.asc