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being phased out throughout the industry More recent 8mm EXAbyte or 4mm Digital Audio Tapes are supported at many locations Earlier forms of storage can sometimes be used by consolidating the data on several cartridges For example, magneto-optical cartridges or SyQuest cartridges in various sizes can sometimes be used for distributing data to a replicator Since these media usually cannot store the complete contents of a CD-ROM and certainly not a DVD-ROM, you need to carefully document the le contents for the replication service Prepare a comprehensive list of source les to help the replicator assemble a CD-ROM image, DVD-ROM image, or DVD-Video image during premastering
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In setting up a workstation to perform CD-R or DVD-R recordings, you may want to consider the hardware-related information in the following subsections
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To ensure constant operation for maintaining data ow during disc recording, there is one more item you should add to your developer s workstation An Uninterruptible Power Supply (UPS) large enough to handle both your host computer and the disc recorder can provide the extra insurance that short power interruptions or glitches in the line voltage will not disturb the integrity of the recording Power interruptions that might otherwise go unnoticed, because they might not be long enough to cause your system to shut down, or to cause unrecoverable data loss to occur in normal transfer operations, could conceivably ruin a CD or DVD recording A UPS ensures a steady ow of power to your computer and recorder for the 15 minutes to an hour that it takes to complete a recording If you notice during the course of a day how many times the lights icker off and on or dim, you are witnessing the potential for ruined media at any time recording is taking place A capable UPS large enough for a computer and recorder may cost from $250 to $600 For any kind of professional application or in a production environment where lost time is critical to your business, we recommend that you buy one and use it
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5 Hard Disk Considerations
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The combination of increased processor performance and advanced hard disk drive designs has reduced the concern that used to exist over data transfers from hard disk to recorder Drives that are capable of average seek times from 15 milliseconds down can typically retrieve data fast enough to keep most disc recorders operating smoothly If you are using an older drive for disc recording applications, seek out an A/V model A/V (audio/video) drives became a popular add-on peripheral for use with CD recorders in the late 1990 s This drive type originated to solve a common problem with audio and video capture, such as when performing digital recording to disk or when using a video capture board As with CD recording, the string of data being sent to the hard disk needs to be continuous Any interruptions will result in an audio track that misses a beat or a video sequence that drops several frames A/V drives typically solve this problem in two ways One involves thermal calibration The other involves the manner in which data caching is handled Although these two features were designed in response to the needs of audio and video capture, they suit the requirements of CD recording perfectly
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Thermal Calibration Thermal calibration is a dynamic, periodic ne-tuning operation that high-capacity non-A/V drives perform in response to changing internal drive conditions The gradual rise in temperature inside the drive requires adjustments to compensate for the relative locations of the drive read/write heads and the platters This adjustment occurs during a thermal calibration cycle, sometimes called a T-cal, which occurs on a periodic basis without regard for the current computer or disk operation being performed A/V drives circumvent this problem by rescheduling the thermal calibration for less critical times, periods when no signi cant data transfers are taking place While a T-cal cycle on a non-A/V might interrupt data ow just long enough to disrupt a write operation to a compact disc (ruining the disc), an A/V drive does not enter a T-cal cycle during a write operation, and thus ensures disc data integrity Data Caching
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Caching of data is another area where A/V drives differ The most common types of computer hard disk activities involve frequent small transfers of data, and the disk cache is tailored to these kinds of operations In comparison, disk caches on A/V drives are optimized for large, continuous transfers of data, such as take place when a video stream is being dig-
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