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This chapter summarizes the hardware used to store data les: mainly tapes and disks These descriptions will provide background for the understanding of their operation and performance; in other words, the concern here is what the devices do rather than how they do it After this chapter all analysis refering to hardware will be made using a limited number of parameters and concepts established here Six parameters are adequate to describe the performance of all types of current hardware with su cient precision The material is organized into two major interrelated sections: the rst section contains a review of the types of hardware available, and the second section discusses the parameters used to describe hardware Along with basic performance data, cost estimates are provided since the bene ts of good performance cannot be separated from the expenses associated with powerful devices Section 2-3 presents hardwarerelated programming concepts, and the chapter concludes with a summary of the parameters for recall and reference 13 provides some further discussion of storage system architecture The remainder of the book needs to make very few direct references to hardware 27
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in this book, due to the parameterization New or improved storage devices are continually being developed, and any description re ects the state at the time of writing The reduction of hardware descriptions to the small set of parameters makes it possible to use the analysis and design procedures in the remainder of the book also for devices which are not described or even not yet invented Typical values of parameters for the types of hardware discussed are given in Table 2-1 The use of recent devices will make the problems in subsequent exercises more interesting The abbreviations used in formulas can be found on the inside covers and in Appendix B 2-1 HARDWARE CHOICES
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Since this section surveys the varieties of hardware available for les and Sec 2-2 de nes the parameters needed to describe their performance, some cross referencing may be necessary when encountering new terms in the section below 2-1-1 Mechanical Storage Some use is still made of mechanical storage for data, using storage media which were already developed before the turn of the century: One such medium is the Hollerith or ibm card Cards store data by having holes punched to encode a character per column Cards with 80 columns of 12 bit positions each are the most common, other cards exist with 90 6 positions, and special cards are in use for attaching to inventory items Paper tape is still used at times to record raw data from measuring instruments Holes, punched into eight tracks across according to the ascii code (see Fig 14-1), record data and a check bit The paper storage media can be used only once for the recording of data The punching devices, being mechanical, are slower yet than the readers, which typically use light-sensitive sensors 2-1-2 Magnetic Tape Storage In traditional data-processing operations magnetic tape was predominant Two categories, typi ed by cassettes and reels of tape, o er distinguishable capabilities Tapes and all other magnetic surface devices have identical performance characteristics when reading or writing Figure 2-1 illustrates the principle of magnetic digital recording Limited amounts of data can be stored by the use of cassette or cartridge tape The magnetic tape in these packages is 0150 inch (38 mm) or 0250 inch (64 mm) wide and typically 300 feet (100 m) long A single track of data bits is recorded along the tape, and a parallel track may be used for timing or addressing information The low cost of purchase and storage of tapes makes their use attractive for the storage requirements on workstations Attempts to standardize these types of types have resulted in a plethora of incompatible standards , so that data interchange to workstations of di erent types is commonly performed over communication lines, creating distributed systems
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