21. With the introduction of magnetic disk systems executive became more complex, using overlaying to reduce its memory footprint. 22. It was a single large magnetic disk that retrieved and stored all the data processed by a mainframe. 23. In computer disk storage, a "'sector "'is a subdivision of a track on a magnetic disk or optical disc. 24. Quantum will continue to build some components, such as heads, which read the data stored on a magnetic disk . 25. :A magnet will not only erase the user's data from a magnetic disk but also the low-level formatting data. 26. IBM says it has broken the magnetic disk -drive storage barrier of 10 billion bits of data per square inch. 27. *In 1956, IBM sold its first magnetic disk system, RAMAC ( Random Access Method of Accounting and Control ). 28. The bus was used by Digital to interconnect its highest-performance computers with magnetic disk and magnetic tape storage equipment. 29. Heat-assisted magnetic recording is a nanophotonic approach to increasing the amount of data that a magnetic disk drive can store. 30. In 2002, the Magnetic Disk Heritage Center began restoration of an IBM 350 RAMAC in collaboration with Santa Clara University.
