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In Windows XP, because you cannot test the CD-burning capabilities of the CD burner before you start the write process, a CD-R disk could potentially be ruined because of a buffer under-run. There is no way of running a test write to the CD-R prior to the actual burning of the CD-R.
A test write to a CD is simple a test of the writing of data to the CD-R. The reason it can be tested is because the test burn is done at a read level. In this way, nothing is actually written to the CD-R during the test.
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