What is the X rating on flash memory and how is this number generated?
Resolution:
Flash cards with a higher X-speed rating are designed to perform faster. The X-speed rating can also be translated
into another common measurement of performance - MegaBytes (MB) per second of write speed. To determine the actual
MB per second, you must know the value of "X" and do the math using the multiplier number and the value of X as claimed by the
product. For example:
Value of X = 150 KiloBytes* per second, noted as 150 KB/sec.
50X = 50(multiplier) x 150KB/sec or 7.5 MB/sec
* 1 KB = 1,000 Bytes; 1 MB = 1 million Bytes.
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