<Tr> <Td> Blu - ray Disc </Td> <Td> 36.000 </Td> <Td> 4,500.0 </Td> <Td> 4,394.5 </Td> <Td> 4.29 </Td> <Td> 25.0 GB </Td> <Td> 23.28 GiB </Td> <Td> 180 </Td> </Tr> <P> Modern compact discs support a writing speed of 52X and higher, with some modern DVDs supporting speeds of 16X and higher . It is important to note that the speed of writing a DVD at 1X (1,385,000 bytes per second) is approximately 9 times faster compared to writing a CD at 1X (153,600 bytes per second). However, the actual speeds depend on the type of data being written to the disc . </P> <P> For Blu - ray discs, 1x speed is defined as 36 megabits per second (Mbit / s), which is equal to 4.5 megabytes per second (MB / s). However, as the minimum required data transfer rate for Blu - ray movie discs is 54 Mbit / s, the minimum speed for a Blu - ray drive intended for commercial movie playback should be 2X . </P> <P> Historically, the 1X writing speed is equivalent to the 1X reading speed, which in turn represents the speed at which a piece of media can be read in its entirety - 74 minutes . Those 74 minutes come from the maximum playtime that the Red Book (audio CD standard) specifies for a digital audio CD (CD - DA); although now, most recordable CDs can hold 80 minutes worth of data . The DVD and Blu - ray discs hold a higher capacity of data, so reading or writing those discs in the same 74 - minute time - frame requires a higher data transfer rate . </P>

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