The first hard drive was the IBM 350 Disk Storage Unit, introduced in 1956 as part of the IBM 305 RAMAC computer system. It could store 3.75 to 5 megabytes of data on 50 24-inch platters, weighed over a ton, and was roughly the size of two large refrigerators.
This introduced the concept of random access storage, which was a major improvement over previous methods like magnetic tape and punched cards.
Will never forget that magical time.