Limitations as a secondary storage device optical

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Unformatted text preview: ns of Optical Disks Advantages As a secondary storage device, optical disks have the following advantages: 1. The cost-per-bit of storage for optical disks is very low because of their low cost and enormous storage density. 2. The use of a single spiral track makes optical disks an ideal storage medium for reading large blocks of sequential data, such as music. 3. Optical disk drives do not have any mechanical read/write heads to rub against or crash into the disk surface. This makes optical disks a more reliable storage medium than magnetic tapes or magnetic disks. 4. Optical disks have a data storage life in excess of 30 years. This makes them a better storage medium for data archiving as compared to magnetic tapes or magnetic disks. 5. Since data once stored on an optical disk becomes permanent, the danger of stored data getting inadvertently erased/overwritten is not there with optical disks. 6. Due to their compact size and light weight, optical disks are easy to handle, store, and port from one place to another. 7. Music CDs can be played on a computer having a CD-ROM drive along with a sound board and speakers. This allows computer systems to be also used as music systems whenever desired. Limitations As a secondary storage device, optical disks have the following limitations: 1. It is a read-only (permanent) storage medium. Data once recorded, cannot be erased and hence the optical disks cannot be reused. 2. The data access speed for optical disks is slower than magnetic disks. 3. Optical disks require a more complicated drive mechanism than magnetic disks. Uses of Optical Disks Optical disks are typically used for one or more of the following purposes: 1. For distributing large amounts of data at low cost. For example, a complete encyclopedia, dictionary, world atlas, dictionary of quotations, biographies of great people, information about all educational institutions of a particular type in a country, etc. are often distributed on CD-ROM disks. 2. For distribution of electronic version of conference proceedings, journals, magazines, b...
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