I was at the Great Oaks (former IBM) facility in San Jose a few months ago. It's a massive place and now owned by HGST (a Western Digital Company), for whom I work. There is still a major amount of storage R&D going on there but, somewhat sadly, a number of the old IBM buildings with their distinctive block tile patterns, as seen in the film, are being demolished to make way for new facilities.
Edit: You can see a RAMAC unit at the Computer History Museum in Mountain View - well worth a visit if you're into computer stuff.
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