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Disc Duplication Recording Options |
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Lighthouse Digital Media provides clients with three recording options for disc duplication. Lighthouse duplication equipment can record discs using one of three different methods:
Standard Recording Standard Recording ingests data from the master disc and then records to blank discs. If a problem is detected during recording with a target disc, the system automatically terminates recording to that particular failed disc. When successful recording has completed to remaining discs, the failed disc is removed and isolated for inspection. At Lighthouse, we don’t attempt to reuse previously failed discs. Any disc that fails recording is analyzed and then discarded. It’s uncommon to have disc failures, because we test and pre-certify discs before using them in client duplication. However, a defective disc can occasionally and will inevitably slip through disc manufacturers' quality control processes. Discs duplicated using Standard Recording, records data with reasonably high confidence of integrity and accuracy. It does NOT test to verify that discs are actually “readable” following recording. Standard Recording does NOT 'compare' that digital bits on the master, are identical to bits recorded on duplicated discs. Standard Recording is comparable to methods employed by most commercial duplication sources.
Read Verification Recording Read Verification Recording uses the same process in Standard Recording -- then adds a final test procedure. A 'read verification' test is completed on each recorded disc. After content is written, discs are tested to verify that they are actually readable. Data that's recorded is 'put-down' in a specified structure defining either a CD-R or DVD-R disc. The system attempts to recognize and read the expected structure. If the structure is correct and can be read, the test is successful. Otherwise, if a disc fails read verification, it’s removed, isolated and a new disc is duplicated.
Bit Comparison Recording Bit Comparison Recording is the most accurate method to confirm that digital bits recorded to cloned discs are identical to bits from the master. After discs are recorded, data-bits residing on the master are compared to data-bits recorded on discs. In addition, a Read Verification test (see above) automatically occurs during Bit Comparison Recording. Bit Comparison Recording requires additional time. It can increase duplication durations by 400% over Standard Recording. But, it’s the ultimate method to ensure that digital bits cloned on duplicated discs are absolutely identical to those on the master. We suggest using Bit Comparison Recording when master content is of critical importance or recorded content must be confirmed as having high data integrity through bit-level accuracy. Some application examples for Bit Comparison Recording can include: historical archives used for long-term retention, mission-critical data, medical data, security imaging, regulatory data or legal evidence. 919.552.5525
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