50kW class laser.
Another source claims 1um wavelength with individual 1.5kW lasers in a hex pattern — unclear if it’s a phased array (would be awesome) or just trained on the same target (source mentions they are “combined using a mirror” so probably the latter).
Sounds like maybe high power YAG?
Take numbers with a grain of salt, e.g., this link says a 7200RPM 160GB SATA drive from 2004 is $107, or about $0.67/GB, instead of the $5 claimed in post.