The Zen of Data Flow in Software

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The Zen of Data Flow
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The Zen of Data Flow
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There is one aspect of CD and DVD recordable technology in its present state that you should be thoroughly aware of before you begin the need for maintaining a consistent, unbroken ow of data from the time when you rst start recording to the nalization of the disc Successful recording demands delivering the data to the CD-R or DVD-R at a speed equivalent to the recording speed without interruptions You can t go back and correct data that has been erroneously recorded once the laser strikes the dye layer, the impression is formed and the result can t be erased Rewritable forms of optical recording (CD-RW, DVD-RAM, and so on) don t suffer from this same limitation, but they also don t produce discs that are suitable for mastering or for widespread distribution to other platforms or systems The traditional allies of computer data-transfer techniques high-speed bus interfaces, buffers, and caches prove useful in this regard Since in most cases the data you'll be recording will be initially stored on hard disk, your hard disk must be of reasonably modern vintage to support the necessary transfer rates Many CD recorder software packages recommend data access rates of 16 milliseconds or better (in other words, less than 16 milliseconds) to support an uninterrupted data ow once recording starts If you re pulling les from different locations on your hard disk, rather than sequentially from a dedicated partition serving as a virtual image of the CD-ROM, be sure to defragment your disk drive before recording This helps ensure that the les will be transferred smoothly Most CD recorders and DVD recorders have some type of built-in cache buffer This type of buffer can compensate for slight interruptions in the data ow from the hard disk Since we re talking about half a Gigabyte or more being transferred over ten minutes to an hour, there are obviously a lot of data bits moving through the cable, resulting in a great potential for many things to go wrong As recording speeds have gradually risen from 2x to 4x and now to 6x and 8x, many manufacturers have increased the size of the recorder buffer, with many units including a 2MB built-in buffer Recorder software often sets aside an area on disc to use for buffering the data ow during transfers from the system to the recorder This provides an additional level of insurance during the recording process to keep the steady ow of data from being interrupted As discussed in later chapters, you have a number of options when you are recording to minimize the chance of failures, including turning off all necessary processes (screen savers, network monitors, and so on), disabling hardware on the
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same bus as the recorder (scanners, digital cameras), organizing your disc data by defragmenting your drive, and performing test recordings before actually burning a disc Some professionals recommend using two SCSI host adapters, one for the hard disk drive and another for the CD-recordable unit, but I ve also seen contrary recommendations Some premastering applications suggest you should only use a single host adapter No single set of guidelines can cover every conceivable hardware con guration, and even the experts sometimes disagree on the right approach Try to take each different recommendation with a grain of salt (including those presented in this book) and never discount your own experiences
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As a prerequisite to making interesting and useful CD-ROMs and DVD-ROMs, as opposed to merely copying data to disc, you need to know how to choose a data format and manage the les being recorded to the optical disc The various formats evolved in response to requirements for storing and retrieving different kinds of data from disc knowing the rationale behind the different modes of data storage can help you produce discs that are compatible with the widest range of equipment and that deliver data in the fastest and most effective manner
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