History: IBM 3390, World’s Largest and Most Expensive HDD Teardown

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IBM 3390: The world’s largest and most expensive hard drive teardown
This drive, which originates from around 1989, would’ve been teamed up with a number of other drives and slotted into a IBM 3390 Direct Access Storage Device (DASD) – a floor-to-ceiling server rack. One IBM 3390 model was capable of storing up to six drives, for a total capacity of 22.7GB. A complete IBM 3390 system had a data transfer rate of 4.2MB/s, with an average seek time of 12.5 milliseconds. The platters probably span at around 2,500-3,000RPM.