Difference between revisions of "Magnetic storage"
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| − | '''Magnetic storage''' is the storage of information in thin layers of magnetic material | + | '''Magnetic storage''' is the storage of information in thin layers of magnetic material - very fine particles of magnetic material mixed with a binder, which caused the coating to adhere to the underlying surface. The material was originally an iron oxide formulation, but many different substances have been used. |
The process uses a magnetic [[head]] to write small areas which are magnetized in one direction or another (depending on the direction of the 'write current' through the coil in the head). | The process uses a magnetic [[head]] to write small areas which are magnetized in one direction or another (depending on the direction of the 'write current' through the coil in the head). | ||
For most of the lifetime of magnetic storage, these areas have had their magnetization direction parallel to the surface of the magnetic material; this was the easiest direction to create heads for. Recent developments have been the creation of heads which can write magentized regions in a vertical direction; the can be smaller, thus increasing the information storage density. | For most of the lifetime of magnetic storage, these areas have had their magnetization direction parallel to the surface of the magnetic material; this was the easiest direction to create heads for. Recent developments have been the creation of heads which can write magentized regions in a vertical direction; the can be smaller, thus increasing the information storage density. | ||
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| + | The physical medium used has included [[drum]]s, [[disk]]s and [[magnetic tape]] - all typically [[secondary storage]], although some very early computers used drums for [[primary storage]]. | ||
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Revision as of 14:03, 30 September 2017
Magnetic storage is the storage of information in thin layers of magnetic material - very fine particles of magnetic material mixed with a binder, which caused the coating to adhere to the underlying surface. The material was originally an iron oxide formulation, but many different substances have been used.
The process uses a magnetic head to write small areas which are magnetized in one direction or another (depending on the direction of the 'write current' through the coil in the head).
For most of the lifetime of magnetic storage, these areas have had their magnetization direction parallel to the surface of the magnetic material; this was the easiest direction to create heads for. Recent developments have been the creation of heads which can write magentized regions in a vertical direction; the can be smaller, thus increasing the information storage density.
The physical medium used has included drums, disks and magnetic tape - all typically secondary storage, although some very early computers used drums for primary storage.
