Magnetic disks in Software

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A major problem with any recording tape is the fact that the data is strewn out along a highway. To get from one bit of information to some other bit, it might be necessary to traverse the entire length of the highway. The distance can be hundreds of feet! But on a magnetic disk, no two bits of data are, in practice, ever separated by a distance greater than the diameter of the disk. Because of this, disks are faster than tapes for data storage and retrieval. Magnetic disks are popular for digital data. They aren t often used in analog applications, although R & D continues in the quest for a reliable, high-resolution, magnetic video disk. Personal and commercial computers almost always use magnetic disks. They come in two forms: the hard disk and the floppy disk or diskette. The hard disk in a typical PC can hold several gigabytes of data. This figure doubles every few years, and the trend can be expected to continue until the point of diminishing
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Quiz 535 returns is reached. Hard disks are permanently installed in the computer. You can t take out and replace a hard disk. Complex software particularly the kind involving graphics, video games and simulations, and complex mathematics needs a lot of memory space, and as the software itself becomes more and more sophisticated, consumer demand will follow along with it. Thus, you might see, before too long, a hard disk with several terabytes (TB) of capacity. A terabyte is about 106 MB. (You are invited to figure out how many average-sized novels could be written on such a disk!) Floppy disks and diskettes can be interchanged in seconds, so there is no limit to how much data you can sock away on them. A full-wall bookcase of floppies could have more manuscript than you d write in 1,000,000 years. A typical PC floppy disk comes in a flexible, square package measuring 5-1/4 5-1/4 inches and is about 1 mm thick. These disks usually have 1.2 Mb of capacity. Larger floppies are used in commercial computers. A smaller diskette is in a rigid, square package measuring 3-1/2 3-1/2 inches and is slightly thicker than the floppy package. It holds (oddly) a little more data than its physically larger floppy cousin: 1.44 Mb. It probably won t be long before the memory capacities of floppy disks and diskettes increase, so don t take these figures too seriously.
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Speech and music are commonly stored on compact disks (CDs). This medium offers several advantages over magnetic tape. Some CDs can store video data. The main asset of CDs is their superior reproduction quality. All of the problems associated with older vinyl disks are eliminated. There is no limit to the number of times a CD can be replayed, because laser beams are used to recover the sound. The lasers bounce off tiny pits on the disk. Light beams, of course, do not scratch the CD; nothing mechanically rubs against the disk. A CD won t jam because it does not move while it is being replayed. The data can t be distorted by stretching, as can happen with magnetic tape. Modern CD recording devices digitize the speech or music. This results in theoretically infinite reproducibility, because digital highs and lows (logic ls and 0s) are unmistakable and do not get distorted. A multigeneration reproduction (say, a recording of a recording of a recording of a recording of a recording) sounds every bit as good as a first-generation reproduction. Of course, there s a limit to how many digital reproductions can be made without error; no system is perfect. A 500th-generation digital recording might have a few errors, where stray noise pulses have mutated ls into 0s or vice-versa. But a 500th-generation analog reproduction would consist of indecipherable hash.
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