In a few short years since the launch of the first 4Mb flash memory card, the number of flash memory cards available for digital cameras and other devices has exploded with a number of different formats and speeds of memory card. It’s no wonder the average person is totally baffled by this plethora of memory cards.
Not only are there different shapes (the format) and sizes such as Secure Digital (SD) Compact Flash, Memory Stick etc, but also different speed ratings.
Memory card speed is the card’s performance with regard to how quickly data can be transferred to or from it. The card speed is often stated in ‘Times’ ratings i.e. 12X, 40X etc (just as the speed of recordable CD’s and DVD’s is measured), and sometimes more specifically in megabytes per second (Mb/s). By today’s measure, sub 20X represents a standard speed, 20X to 40X is mid-high speed and over 40X is high speed. The chart below shows the relationship between the two figures.
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12X = 1.8 Mb/sec
20X = 3.0 Mb/sec
25X = 3.8 Mb/sec
30X = 4.5 Mb/sec
40X = 6.0 Mb/sec
60X = 9.0 Mb/sec
66X = 10.0 Mb/sec
