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Some of the pictures in the video are a little out of sync for the timeline. The early IBM drives used hydraulic means to move the heads across the platter. The linear motor design (like a speaker's voice coil) was suggested by of the IBM Engineers, but was rejected. The Engineer left to form a company called ISS (Information Storage Systems), up in Cupertino, and made their own disks with this technology. IBM eventually licensed the technology back from ISS.
Below is a picture of the Production Test department of ISS from around 1978. The drives in the picture were the new 300MB Winchester drives. Oh, and I'm about dead center in the picture.
The Navy sonar systems I worked on had the washing machine size hard drives. We opened the top, dropped in the platter stack, initiated the vacuum and let them spin up.