Quantum was the premiere maker of SCSI drives back in the day. They were beating IBM and IBM needed more capacity so IBM bought them. Then IBM sold to Hitachi, who sold the drive business to Western Digital who sold the drive business to Toshiba.

I believe these Deskstar types and derivatives are the same essential mechanism and processes as those old quantum drives (probably especially in terms of the QA processes). The heads and the technology have improved to give better capacity of course, but I've been buying and relying on these drives for ~25 years at this point.

I'm not surprised to see them showing up well on these charts.