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The Key Reason Why Tape Library And Autoloader Magnetic Tape Storage Solutions Are The Chosen Data Storage Devices For Backup Of Data
Computer storage devices browse and record data coded as magnetized spots on a medium that represent a binary code - a series 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. To be able to record data, electrical charges that create a certain magnetic pattern on the covering of the magnetically sensitive medium are sent through the head. To read through 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, like a PC screen. The data can be kept forever, or deleted and replaced with new magnetic spots.
The two main kinds of magnetic storage devices are hard disk drives and magnetic tape devices. Magnetic tape solutions such as a tape library write, retrieve and save data on many 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 rate 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 huge amounts of information can be stored in a fairly compact space. For example, some tape library models such as Quantum Scalar's i6000 tape library can save over 5,500 terabytes of data. Furthermore, tape devices have always been the quickest and popular method of reading and writing huge amounts of data. The downside of tape systems, on the other hand, is that the tape must be read from one end to the other in order to get 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 in which stored data can be eventually 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 about 705,700 magnetic tape storage components were shipped by U.S. producers, valued at about $1.9 billion.
A hard disk magnetic storage device is similar to a pile 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 info. Every bit of information stored on the disks is accessible by the heads every time the stack rotates.
The benefit of hard drives is that they can rapidly get information nonsequentially because of the magnetic head's ability to move quickly and freely throughout the entire surface of the disk. In addition, since they are compact, they make great storage devices for microcomputers. Disk drives with greater capacities are normally used in workstations, minicomputers, local area networks (LANs), as well as mainframes. Hard drives for larger computer systems are mostly 14-inch, 10-inch, or 8-inch drives. Microcomputers usually have 5.25-inch, 3.5-inch, 2.5-inch, or 1.8-inch drives. Smaller disks usually hold one to two megabytes of info.
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