Ecco qualcosa sulle velocitā, prelevato direttamente da wiki...
Quote:
Speed
Flash memory cards are available in different speeds. Some are specified the approximate transfer rate of the card such as 2 MB per second, 12 MB per second, etc. The exact speed of these cards depends on which definition of "megabyte" the marketer has chosen to use.
Many cards are simply rated 100x, 130x, 200x, etc. For these cards the base assumption is that 1x is equal to 150 kibibytes per second. This was the speed at which the first CD drives could transfer information, which was adopted as the reference speed for flash memory cards. Thus, when comparing a 100x card to a card capable of 12 MiB per second the following calculations are useful:
150 KiB x 100 = 15000 KiB per second = 14.65 MiB per second.
Therefore, the 100x card is 14.65 MiB per second, which is faster than the card that is measured at 12 MiB per second.
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EDIT: Il link della pagina:
http://en.wikipedia.org/wiki/Flash_memory#Speed