By 1963, IBM’s latest Disk Storage Unit (the 1302) had four times the storage capacity of the 1301. The 1302 could record 117 million 6-bit characters per module. Access time was 165 ms, and data could be transferred at 180,000 characters per second. It sold for $252,000. In 1964, something changed in IBM’s sales model. With the 2311, the company stopped selling Disk Storage units in conjunction with a specific line of computers. This one was “swappable” with many different types of computers.