Punched cards also proved useful on a larger . The first standardized card formats were introduced by IBM. They were made of cardboard which required replacement after Phone Number List just a dozen or so cycles of use. The first HDD drives In common parlance HDD drives are often called "hard drives." The capacity of the first data storage medium of this type designed in by IBM was only MB. Nowadays this may seem like a small space but remember that at that time it was an innovative idea and the capacity requirements were completely different than today.
The disk drive took up the entire room and required the constant work of people. The disk itself consisted of magnetic spinning platters and the data access time was ms. However already in the s new designs reduced the time of reading and writing data to ms and disk capacities were increased to several dozen megabytes. Currently the access time in the latest HDD designs is just a few milliseconds. Innovations of the s In the s the IBM disk appeared with an innovation at the time an error correction mechanism. It was possible to replace data carriers each of which had a capacity of MB.