Its format should evolve in a compatible way so old media can still be accessed by new systems.Complex data structures such as B-tree are not good candidates for this purpose. This is important when this format is implemented in embedded devices (DVD player, Camcorder, Camera, etc). Its format should be as simple as possible.Some media is write once (CD-R, DVD-R, DVD+R, BD-R), some needs defect-management (CD-RW, DVD-RW, DVD+RW, BD-RE, etc), some needs to be expanded sequentially before being overwritten (most RW media). Optical media is very different from hard drives.
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