Removable Memory Planet : Portable memory

Again with  removable memory planet, today removable memory planet will present about modern removable memory devices offer an incredible number of options, with storage capacities ranging from the 1.44 megabytes (MB) of a standard floppy to the upwards of 20-gigabyte (GB) capacity of some portable drives. All of these devices fall into one of three categories

1) Magnetic storage

2) Optical storage

3) Solid-state storage

Magnetic storage

Removable memory planet mentioned about magnetic storage is the most common and enduring form of removable memory technology. For example, the 1.44-MB floppy-disk drives using 3.5-inch diskettes have been used around for about 15 years and they are still found in our everyday life. Removable magnetic storage uses a drive which is a device that connects to the computer. The way to use is inserting the media, which is the part that actually stores the information, intothedrive.

The media used in removable magnetic memory devices is coated with iron oxide. This oxide can be permanently magnetized if exposed to a magnetic field. The media is called a disk or a cartridge. The drive uses a motor to rotate the media at a very high speed and it can access the stored data by using smell devices called heads.

Each head has a tiny electromagnetic, which consists of an iron core wrapped with wire. The electromagnetic applies a magnetic flux to the oxide on the media and the oxide permanently remembers the flux it sees. During writing, the data signal is sent through the coil of wire to create a magnetic field in the core. At the gap, the magnetic flux forms a fringe pattern. This pattern bridges the gap, and the flux magnetizes the oxide on the media. During reading, the read head pulls a varying magnetic field across the gap, creating a varying magnetic field in the core and therefore a signal in the core. This signal is sent to the computer as binarydata.

Removable memory planet : Magnetic storage disk

Removable memory planet : Disk drive