Mass Storage (defined)

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A Mass Storage Device can be defined as: Any device used to supply relatively inexpensive storage for large amounts of data. A sort of jukebox for optical disks or tape cartridges. A mass storage unit can automatically load any disc or tape in its library to provide quick access to vast quantities of information. (Computer Dictionary, Third Edition by Donald Spence, Camelot Publishing)

The text written for this paper will utilize several kilobytes of storage space. Several pictures are included in this paper. The pictures will utilize several hundred kilobytes of storage space. The finished paper will utilize about one megabyte of storage space - nearly an entire 3.5-inch floppy disk. But there is plenty of space on the hard drive. Or is there?

This picture (from: www.storage.ibm.com/storageadsmhome.htm) illustrates typical amounts of storage space used by common files.

Increased demand for storage space affects many people - from individuals (e.g. a Robert Morris College student) to corporations (e.g. USX). The solution for the student is an easy one. Purchase and install a larger hard drive. Or perhaps consider deleting those files from Speech Communications 2 class. The corporation will tackle this problem differently then the student will. One possible option is the use of Mass Storage.

Four types of Mass Storage technologies will be discussed: Hard Drives, Optical Disks, Tape Systems and the idea of HSM. The main idea all of these technologies is to end up with additional storage space - especially hard drive space.

Hard Drive Storage

Hard Drive Technologies could be compared to the hard drive of a personal computer or to floppy disks. Data and programs are stored on magnetic coated disks. Hard drives are fast, but they are expensive.

The capacity of hard drives is increasing. Computer Shopper magazine recently featured a 50 gigabyte hard drive. Additionally, the price of hard drive storage has been decreasing. But to continually purchase addition hard drive space may not be the most efficient business choice. Older files may hold great value. Deleting them to free up more space may not be an option.

Removable disk drives can be used to free up hard drive space. A Zip Drive can hold 250 megabytes of data. A Jazz Drive can hold up to 2 gigabytes. Storage can also be increased using RAID technology. RAID is the acronym for Redundant Array of Independent Disks. RAID is a storage device that can hold and control multiple hard drives.

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