What means Max 15 Mb/s showin in SDHC cards?
I bought a SanDisk Ultra II 16GB/15MB SDHC Card to use in my Sony XDCAM-EX1 camera and it works perfectly well with the highest bit rates (1080p30HQ at 35 Mb/s bit rate).
However, the card shows that the max bit rate is 15 Mb/s. So can you explain what it means ? Why should a card showing a linit of 15 Mb/s works well to record clips at 35 Mb/s rate ? |
Look carefully at the capitalizations used:
Mb = megabit MB = megabyte Ignoring the overhead involved in various types of data transfer, there are eight bits per byte. The codec rate is 35 Mb/sec (which somewhere between 4.5 and 5.5 megabytes per second) As for speed ratings on flash cards, they are usually fibs told by over-zealous product marketing drones. |
BTW on the back of the package of the Sandisk Ultra 2 32GB cards it says 9MB write 15MB read.
I did a read/write test Crystal Disk Mark and I thought the results were 20MB write 17MB read or something like that. |
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