Revision: 20070726_005652 | All Revisions
Flash memory cards--CompactFlash, Secure Digital Card, etc.--are getting faster and faster. Recently, 150x cards can be had for a mere $5 dollars. Few know exactly what 150x really mean. Sure everyone knows that the higher the number, the faster the card. And sure, 150x is three times faster than a 50x card. But exactly how fast can you save an image at 150x?
In reality 1x is equivalent to 0.15 MB/s, or 1.2 Mb/2. (Don't know the difference between MB and Mb? See Megabytes vs. Megabits.) The chart below shows the speed factors and their equivalent transfer rate.
|Factor||Transfer Rate (MB/s)||Transfer Rate (Mb/s)|
What can you do with this knowledge? Well, you can determine how long it will take your digital camera to save a photograph onto a particular card.
For example, a raw image shot with the Panasonic Lumix DMC-LX1 takes up 16.1 MB of space. Using the chart above, you will see that it will take just over 1 second to save this photograph on a 100x card.
You can also do the reverse. If it takes the Panasonic Lumix DMC-LX1 1 second to save a 16.1 MB raw image, then you know the camera is capable of writing the data at 100x.
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