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o ce-system market The high capacity of optical discs means that write-once disks are often adequate A write-once disc has the potential advantage that all past versions of the data remain available, providing an excellent historical audit trail The le organizations available from magnetic disks are not directly applicable to write-once optical discs; and this is slowing their acceptance Write-multiple-times discs are likely to have a lower density, and hence less capacity The applications will eventually determine the tradeo to be made between capacity and retention of versions versus ease of reuse of storage area A bit is recorded on optical media by the heat of a laser changing a miniscule spot in the coating of the disc To read the data, a beam of light at a lower level of energy is guided to the bit position Changes in re ection will be recognized if a 1-bit has been recorded Semiconductor lasers of adequately high power make economical optical discs feasible The capacity of announced optical write-once discs varies from 300Mbytes to 100Gbytes, with 10Gbytes becoming a reasonable value for small units Their access times are comparable to those of magnetic disks, but because of their greater capacity an exhaustive search over their content will become even more infeasible We present some techniques for write-once storage in Sec 11-3-3
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Other optical devices Other optical recording devices have been manufactured using photosensitive material which is written directly by intense light The chemical changes are then read using either transmission or re ection of light Holographic techniques have been tried as well The information is then distributed in an interference pattern over a large area This approach seems attractive because of its ability to ignore local surface irregularities
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In moving head maganetic and optical disks all recording heads of the disk drive move in or out together, but only one head will actually transfer data at any one time No further physical movement of the arm is required to reach any one of the sets of tracks (10 in the rs-60) that are radially equidistant from the center but on di erent surfaces For these tracks the time required to switch from track to track is only due to electronic switching delays and is negligible This set of tracks forms a hypothetical cylindrical surface at right angles to the physical access directions Since we often use such a set of tracks together, we will use the term cylinder to describe the tracks which we can use without motion of the access mechanism Older disk units will have as many cylinders as one of its disk surfaces has tracks Modern disk units can have wider reading heads that read multiple tracks at the same time, typically 4 or 8 Then the number of cylinders is equal to the width of the head times the number of surfaces accessed Data written sequentially will ll all the tracks of one cylinder before the mechanism will be stepped to the next cylinder
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When very large, archival storage is needed, many tapes or disks can be placed into mechanical storage libraries A mechanical picker mechanism selects the tape reel, cartridge, or disk, carries it to the tape unit, and puts it on
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the reading unit so that it can be read conventionally Such automated storage libraries provide large, but slow to access on-line storage capacity Tape libraries are available both for conventional 1 -inch-tape reels and for the 2 extra-wide-tape strip cartridges shown in Fig 2-19 Fig 2-5 sketched the reading portion from an ibm 1360 unit which actually held 10 bins of the type shown The bins were mounted so that could be rotated under the selection mechanism For very-large storage requirements automated optical disc libraries can be used Their access mechanisms and performance mimics that of tape libraries Once retrieved their contents is accessed as any disc Their capacity and reliablity is likely to be better 2-1-5 Semiconductor Technology The rapid development of integrated circuitry has made semiconductor technology attractive We see applications that were based on secondary storage handled now completely in primary memory, and thus leaving the realm of databases At the same time, new applications for secondary storage devices become feasible as their capacity increases
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