Then they simply must persist the identifier of the DVD and the location in a table in memory. Not knowing any specifics about your DVD, I'd guess they use a similar hash technology to identify the specific DVD you are watching. Occasionally with CD's there would be two commercially available CD's with the same exact hash. The same number will always be obtained by the same input data, and it is very unlikely that the same number is generated from different input data. The basic idea is that an entire block of data can be transformed into a single large number. ![]() ![]() With CD's it was found that you could identify any CD based on a mathematical function called a hash applied to the table of contents. Your DVD player definitely implemented this as a handy feature.
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