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Want to learn about old hard drives? The first hard drive came out in 1956 and was called the IBM 305 RAMAC, (Random Access Method of Accounting and Control). It required 50 24-inch magnetic disks to store five megabytes of data, weighing in at a ton. Then in 1973 IBM introduced the IBM 3340 hard disk unit, known as the Winchester. Seagate introduced the ST-506, the first 5.25-inch HDD, with a capacity of 5 megabytes in 1980 for the personal computer.Want to learn about old hard drives? The first hard drive came out in 1956 and was called the IBM 305 RAMAC, (Random Access Method of Accounting and Control). It required 50 24-inch magnetic disks to store five megabytes of data, weighing in at a ton. Then in 1973 IBM introduced the IBM 3340 hard disk unit, known as the Winchester, it stored 30MB. Seagate introduced the ST-506 in 1980, the first 5.25-inch HDD, with a capacity of 5 megabytes in late 1979 to early 1980 for the personal computer (micro-computer).SCSI was first introduced in 1986. The SCSI-2 standard came out in 1990 and SCSI-3 in 1996.