In the 777 all of the recorders are solid state chips, only older aircraft use tape.
Originally then recorders were tape , then they went with a disk system (kinda like a CD/R-W)and finally to solid state.
There are some talk of transmitting the data/voice directly to the cloud, don’t know if the newest planes are doing that currently
Didn’t the block boxes from the AF crash continue pinging for several years, until they were found and recovered? Why is he MSM harping on this 30 day window?