[awiesenhofer]

> They had machines that could verify the checksum of the disk in three seconds by reading the entire thing with multiple laser heads.

I would love to be able to buy such a drive, would be great to rip all my old discs.

[jedberg]

I don't think the machines could save the data. They just loaded into RAM, took the checksum, compared it to the known good checksum, and then moved on.