Today in 1961, IBM released the IBM 1301 Disk Storage system.
Each module of the 1301 had twenty-five disks with a total data storage capacity of 28 megabytes. One module of the 1301 Model 1 cost $2,100 a month to lease or could be purchased for $115,500.
The storage capacity per square inch of surface was increased 13 times over what it had been with the first IBM disk storage product, the RAMAC technology of 1956. The 1301 increased the throughput of the IBM 7000 series of computers and added significantly to the time the 7000 mainframes could actually compute.