Computer storage appliances browse and record data coded as magnetized spots on a platform that display a binary code - a series of digits comprised of the numbers 1 and 0. A magnetized drive head floating just above the surface of the platform scans and copies data to the disk. If you want to record data, electrical charges that generate a particular magnetic pattern on the covering of the magnetically sensitive medium are sent through the head. To read data, the same head performs the opposite, changing spots of magnetic patterns into electrical impulses that export to a device that makes the data useful to humans, like a PC screen. The data can be kept indefinitely, or deleted and restored with new magnetic spots.

The 2 main forms of magnetic storage devices are hard drives and magnetic tape devices. Magnetic tape solutions such as a tape library write, retrieve and save data on multiple tape cartridges. Presently, the most superior format of tape cartridges is the Ultrium Linear Tape Open, also known as LTO. As of 2010, the 5th generation is the most state-of-the-art, or LTO-5 tape technology. These tape tape units can read and write at a speed of 15 to 20 MB per second local data and can store more than 100 gigabytes of data.

The benefit of magnetic tape storage is that massive amounts of data can be saved in a fairly compact space. For instance, some tape library models like Quantum Scalar's i6000 tape library can save over 5,500 terabytes of data. Furthermore, tape devices have always been the quickest and preferred method of reading and writing huge volumes of data. The setback of tape systems, nevertheless, is that the tape ought to be read from one end to the other so as to get and store info. For this reason, magnetic tape is usually used to copy, or backup, massive quantities of data saved on a network or mainframe system (or for other applications where stored data can be eventually accessed). An autoloader or autochanger is a popular tape drive device used to keep mass data on several tape cartridges; tape libraries are actually larger versions of autoloaders. In 2001 approximately 705,700 magnetic tape storage components were shipped by U.S. suppliers, valued at close to $1.9 billion.

A hard drive magnetic storage device looks like a pile of small metal plates that rotate at a constant speed. Somewhere between each plate, a magnetic head is positioned on an arm that sweeps throughout the disk's surface. Each plate is covered on both sides with a magnetically sensitive component on which a head can read or write data. Every bit of data stored on the disks is reachable by the heads every time the stack rotates.

The benefit of hard drives is that they can quickly get information nonsequentially as a result of the magnetic head's ability to move fast and freely all over the whole surface of the disk. In addition, since they are compact, they make great storage devices for microcomputers. Disk drives with greater capacities are commonly used in workstations, minicomputers, local area networks (LANs), as well as mainframes. Hard drives for bigger computer systems are typically 14-inch, 10-inch, or 8-inch drives. Microcomputers normally have 5.25-inch, 3.5-inch, 2.5-inch, or 1.8-inch drives. Smaller disks typically hold one to 2 megabytes of info.

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