These are the original SDF Kodak Interactive 386/ix UNIX disk drives. In the left to right: Miniscribe 36MB, CDC/Micropolis 40MB, Maxtor XT1140 (137MB) and CDC 338MB disk (used in the 3B2). In the foreground is one of the “fleeting current technology” SATA type drives SDF uses today. This one happens to be 1TB and is already fit for recycle.
While many disks have been drilled or hydraulic pressed prior to recycling, there are still lots that have stuck around over the years.