Today, 69 years ago, on September 13, 1956, IBM successfully developed the world's first computer disk storage device. On September 13, 956, IBM successfully developed the world's first computer disk storage device. IBM350RAMAC is the prototype of the modern hard disk, it is equivalent to the size of two refrigerators, but its storage capacity is only 5 MB. In 1973, IBM3340 was born, he owned the nickname "Winchester", which comes from his two 30 MB storage units. By this time, the basic architecture of the hard disk was established. IBM350RAMAC On September 13, 1956, IBM successfully developed the world's first computer disk storage device. IBM350RAMAC is the nickname of the modern hard disk, it is equivalent to the size of two refrigerators, but its storage capacity is only 5 MB. In