Why Tape Library And Also Autoloader Magnetic Tape Storage Solutions Are The Preferred Data Storage Devices For Backup Of Data
Computer storage appliances browse and record data coded as magnetized spots on a medium that display a binary code - a series of digits comprised of the numbers 1 and 0. A magnetized drive head hanging just above the surface of the medium reads and writes data to the disk. To be able to record data, electrical charges that create a particular magnetic pattern on the covering of the magnetically sensitive medium are delivered through the head. To read data, the same head does the reverse, changing spots of magnetic patterns into electrical impulses that export to a device that makes the data usable to humans, for example a PC screen. The data can be retained indefinitely, or erased and replaced with new magnetic spots.
The two main kinds of magnetic storage devices are hard disk drives and magnetic tape systems. Magnetic tape systems such as a tape library write, retrieve and store data on multiple tape cartridges. Currently, the most sophisticated 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 local data and can store more than 100 gigabytes of data.
The advantage of magnetic tape storage is that massive quantities of info can be stored in a fairly compact space. For example, some tape library models like Quantum Scalar's i6000 tape library can save over 5,500 terabytes of data. Furthermore, tape devices have always been the fastest and preferred method of reading and writing large quantities of data. The disadvantage of tape systems, on the other hand, is that the tape must be read from one end to the other so as to fetch and store data. For this reason, magnetic tape is most often used to copy, or backup, huge amounts of data saved on a network or mainframe system (or for other purposes where stored data can be ultimately accessed). An autoloader or autochanger is a popular tape drive device used to save mass data on several tape cartridges; tape libraries are basically larger versions of autoloaders. In 2001 around 705,700 magnetic tape storage components were shipped by U.S. producers, valued at about $1.9 billion.
A hard disk magnetic storage device looks a lot like a pile of small metal plates that rotate 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 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 reachable by the heads whenever the stack rotates.
The advantage of hard drives is that they can quickly retrieve information nonsequentially due to the magnetic head's ability to move fast and freely throughout the entire surface of the disk. Additionally, as 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 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 2 megabytes of data.
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