• The Reason Why Tape Library And Also Autoloader Magnetic Tape Storage Appliances Are The Preferred Data Storage Tools For Data Backup


    Computer storage appliances read and record data coded as magnetized spots on a media that display a binary code - a sequence of digits comprised of the numbers 1 and 0. A magnetized drive head suspended just above the surface of the media scans and writes data to the disk. In order to record data, electrical charges that generate a particular magnetic pattern on the surface of the magnetically sensitive medium are delivered through the head. To read data, the same head performs the opposite, changing spots of magnetic patterns into electrical impulses that output to a device that makes the data useful to humans, like a computer screen. The data can be retained indefinitely, or deleted and restored with new magnetic spots.

    The two main types of magnetic storage devices are hard disks and magnetic tape devices. Magnetic tape devices such as a tape library write, retrieve and store data on multiple tape cartridges. At present, the most superior format of tape cartridges is the Ultrium Linear Tape Open, or LTO. As of 2010, the fifth generation is the most sophisticated, 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 advantage of magnetic tape storage is that massive numbers of data can be stored in a relatively compact space. For instance, 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 fastest and preferred method of reading and writing massive volumes of data. The disadvantage of tape systems, however, is that the tape has to be read from one end to the other so as to retrieve and store information. For this reason, magnetic tape is mostly used to copy, or backup, massive amounts of data stored on a network or mainframe system (or for other uses where stored data can be sequentially accessed). An autoloader or autochanger is a popular tape drive device used to store mass data on several tape cartridges; tape libraries are generally larger versions of autoloaders. In 2001 close to 705,700 magnetic tape storage components were shipped by U.S. producers, valued at roughly $1.9 billion.

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

    The advantage 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 across the whole surface of the disk. In addition, because they are compact, they make excellent storage devices for microcomputers. Disk drives with greater capacities are commonly used in workstations, minicomputers, local area networks (LANs), and also mainframes. Hard drives for bigger computer systems are mostly 14-inch, 10-inch, or 8-inch drives. Microcomputers typically have 5.25-inch, 3.5-inch, 2.5-inch, or 1.8-inch drives. Smaller disks typically hold one to 2 megabytes of information.

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