The Key Reason Why Tape Library As Well As Autoloader Magnetic Tape Storage Appliances Are The Preferred Data Storage Systems For Data Backup
Computer storage devices read and record data coded as magnetized spots on a media that represent a binary code - a sequence of digits comprised of the numbers 1 and 0. A magnetized drive head floating just above the surface of the platform reads and writes data to the disk. To record data, electrical charges that generate a certain 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 output to a device that makes the data useful to humans, such as a computer screen. The data can be kept indefinitely, or deleted and replaced with new magnetic spots.
The two main types of magnetic storage devices are hard disks and magnetic tape machines. Magnetic tape solutions 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 fifth generation is the most sophisticated, or LTO-5 tape technology. These tape tape units can read and write at a rate 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 large amounts of information can be stored in a relatively compact space. For instance, some tape library models such as 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, however, is that the tape has to be read from one end to the other in order to get and store info. Because of this, magnetic tape is usually used to copy, or backup, large amounts of data stored on a network or mainframe system (or for other uses in which stored data can be eventually accessed). An autoloader or autochanger is a popular tape drive device used to keep mass data on many tape cartridges; tape libraries are actually larger versions of autoloaders. In 2001 about 705,700 magnetic tape storage components were shipped by U.S. manufacturers, valued at approximately $1.9 billion.
A hard drive magnetic storage device resembles a stack 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 coated 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 accessible by the heads every 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 across the whole surface of the disk. Furthermore, since 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 typically have 5.25-inch, 3.5-inch, 2.5-inch, or 1.8-inch drives. Smaller disks typically hold one to two megabytes of info.
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