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Many people assume that the digital ones and zeros that comprise the data stored on the disc are encoded directly as pits and lands, but the reality is actually much more complicated Pits and lands both represent strings of zeros of varying lengths, and each transition between them represents a one, but neither is a direct representation of the contents of the disc Almost half of the information has been used to pad and rearrange (modulate) the data in sequences and patterns designed to be accurately readable as a string of pulses Modulation makes sure strings of zeros aren t too long (no more than 10) or too short (no fewer than two) and that there is only a single one between them (since ones are represented by edges and it s not physically possible to have two edges together) About 13 percent of the digital signal before modulation is extra information for correcting errors Errors can occur for many reasons, such as imperfections on the disc, dust, scratches, a dirty lens, and so on A human hair is about as wide as 150 pits, so even a speck of dust or a minute air bubble can cover a large number of pits However, the laser beam focuses past the surface of the disc so the spot size at the surface is much larger and is hardly affected by anything smaller than a few millimeters This is similar to the way dust on a camera lens is not visible in the photographs because the dust is out of focus As the data is read from the disc, the error correction information is separated and checked against the remaining information If it doesn t match, the error correction codes are used to try to correct the error The error correction process is like a number square, where you add up columns and rows of numbers (see Figure 22) You could play a game with these squares where a friend randomly changes a number and challenges you to find and correct it If the friend gives you the sums along with the numbers, you can add up the rows and columns and compare your totals against the originals If they don t match, then you know that something is wrong either a number has been changed or the sum has been changed4 If a number has been changed, Figure 22 Number Squares.



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What s going on here In this case, the JavaScript code is being stored externally, in a file named scriptjs So what s actually in scriptjs Just the exact lines of JavaScript you want to execute, nothing else For example, in this case, that would be





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When computer technology developed to the point where personal computers became practical and affordable, the need to interconnect them became a necessity, particularly in the business world Naturally the telephone system was investigated, and telephone modems were developed that made possible data communications between computer workstations However, within commercial of ces in the same building a more ef cient method of connecting workstation to workstation to mass data storage servers was needed Companies that had their own PBX telephone system could use telephone modems for data communications Many companies decided to interconnect computers by installing their own networks, called local area networks (LAN) These networks were designed as hard-wired bidirectional networks Large corporations with many of ces spread over several cities developed methods to interconnect the LANs These large data networks were called wide-area networks (WAN) Further expansion gave rise to metropolitan wide-area networks (MWANS) 8131 The network topologies for these networks were basically one of three types: the star, ring, or bus con guration Each had its own access method Figure 8-5 illustrates the basic network concepts The publicswitched telephone network (PSTN) is basically a star network with the local exchange of ce (LEX) at the center of the star where circuits were switched IBM proposed the ring network, where a token was circulated around the ring The station that had the token had permission to transmit to another station This type of system is known as a token-ring net-

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4It is possible for more than one number to be changed in such a way that the sum still comes out correct, but the BD encoding format makes this an extremely rare occurrence

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then a corresponding sum in the other direction also will be wrong The intersection of the incorrect row and incorrect column pinpoints the guilty number and, in fact, by knowing what the sums are supposed to be, the original number can be restored The error correction scheme used by DVD and BD is a bit more complicated than this but operates on the same general principle It is always possible that so much of the data is corrupted that error correction fails In this case, the player must try reading the section of the disc again In the very worst cases, such as, an extremely damaged disc, the player will be unable to read the data correctly after multiple attempts At this point, a movie player will continue on to the next section of the disc, causing a brief glitch in playback A DVD-ROM or a BD-ROM drive, on the other hand, cannot do this Computers will not tolerate missing or incorrect data, so the -ROM drive must signal the computer that an error has occurred so that the computer can request that the drive either try again or give up

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