The Reason Why Tape Library And Autoloader Magnetic Tape Storage Options Are The Preferred Data Storage Tools For Data Backup
Computer storage solutions read and record data coded as magnetized spots on a medium that display a binary code - a series of digits made up of the numbers 1 and 0. A magnetized drive head hanging just above the surface of the medium scans and copies data to the disk. In order to record data, electrical charges that create a particular magnetic pattern on the covering of the magnetically sensitive media are sent through the head. To read data, the same head does the opposite, switching spots of magnetic patterns into electrical impulses that output to a device that makes the data usable to humans, for example a PC screen. The info can be kept indefinitely, or erased and restored with new magnetic spots.
The 2 main types of magnetic storage devices are hard disk drives and magnetic tape systems. Magnetic tape systems such as a tape library write, fetch and save data on multiple tape cartridges. Currently, the most sophisticated format of tape cartridges is the Ultrium Linear Tape Open, also known as LTO. As of 2010, the fifth 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 local data and can save more than 100 gigabytes of data.
The benefit of magnetic tape storage is that large quantities of info can be saved in a relatively compact space. For example, some tape library models like Quantum Scalar's i6000 tape library can save over 5,500 terabytes of data. Additionally, tape devices have always been the quickest and preferred method of reading and writing large quantities of data. The negative aspect of tape systems, however, is that the tape must be read from one end to the other so as to fetch and keep data. Because of this, magnetic tape is most often used to copy, or backup, huge quantities of data stored on a network or mainframe system (or for other purposes where stored data can be ultimately accessed). An autoloader or autochanger is a well-known tape drive device used to save mass data on many tape cartridges; tape libraries are basically larger versions of autoloaders. In 2001 approximately 705,700 magnetic tape storage components were shipped by U.S. companies, valued at roughly $1.9 billion.
A hard disk magnetic storage device looks a lot like a pile of small metal plates that revolve at a constant speed. In between each plate, a magnetic head is positioned on an arm that sweeps across the disk's surface. Each plate is covered on both sides with a magnetically sensitive component on which a head can read or write information. Every bit of information stored on the disks is reachable by the heads whenever the stack turns.
The benefit of hard drives is that they can quickly retrieve information nonsequentially due to the magnetic head's ability to move rapidly and freely across the entire surface of the disk. Additionally, as they are small, they make great storage devices for microcomputers. Disk drives with greater capacities are commonly used in workstations, minicomputers, local area networks (LANs), and mainframes. Hard drives for bigger computer systems are commonly 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 usually hold one to 2 megabytes of data.
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