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Exactly Why Tape Library And Autoloader Magnetic Tape Storage Appliances Are The Chosen Data Storage Systems For Data Backup
Computer storage devices browse and record data coded as magnetized spots on a medium that display a binary code - a sequence of digits comprised of the numbers 1 and 0. A magnetized drive head floating just above the surface area of the platform reads and writes data to the disk. If you want to record data, electrical charges that create a particular magnetic pattern on the surface of the magnetically sensitive medium are sent through the head. To browse data, the same head performs the reverse, converting spots of magnetic patterns into electrical impulses that export to a device that makes the data usable to humans, for example a computer screen. The data can be kept forever, or deleted and replaced with new magnetic spots.
The two main forms of magnetic storage devices are hard disk drives and magnetic tape systems. Magnetic tape devices such as a tape library write, retrieve and save data on several tape cartridges. Presently, the most advanced format of tape cartridges is the Ultrium Linear Tape Open, or LTO. As of 2010, the 5th generation is the most advanced, or LTO-5 tape technology. These tape tape units can read and write at a speed of 15 to 20 MB per second native data and can store more than 100 gigabytes of data.
The benefit of magnetic tape storage is that huge amounts of information can be stored in a fairly compact space. For example, some tape library models like Quantum Scalar's i6000 tape library can store over 5,500 terabytes of data. Furthermore, tape devices have always been the quickest and desired method of reading and writing huge amounts of data. The downside of tape systems, nevertheless, is that the tape must be read from one end to the other so as to retrieve and store info. For that reason, magnetic tape is usually used to copy, or backup, large amounts of data saved on a network or mainframe system (or for other purposes where stored data can be sequentially accessed). An autoloader or autochanger is a popular tape drive device used to keep mass data on numerous tape cartridges; tape libraries are actually larger versions of autoloaders. In 2001 around 705,700 magnetic tape storage components were shipped by U.S. manufacturers, valued at close to $1.9 billion.
A hard disk magnetic storage device looks a lot like a stack of small metal plates that rotate at a constant speed. Somewhere between each plate, a magnetic head is placed on an arm that sweeps throughout the disk's surface. Each plate is coated on both sides with a magnetically sensitive compound on which a head can read or write data. Every bit of information stored on the disks is reachable by the heads each time the stack rotates.
The benefit of hard drives is that they can speedily get information nonsequentially because of the magnetic head's ability to move quickly and freely all over the entire surface of the disk. Additionally, because they are compact, they make great storage devices for microcomputers. Disk drives with greater capacities are usually used in workstations, minicomputers, local area networks (LANs), as well as mainframes. Hard drives for larger computer systems are generally 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 usually hold one to 2 megabytes of information.
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