Card Storage
Towards the end of the 20th century, Mitsubishi and Toshiba joined forces under the prevision of constructing a cheap and convenient storage medium for digital cameras and camcorders. The result was the hugely popular Secure Digital (SD) memory card.
These SD memory cards were so popular that they quite quickly replaced its predecessor, the multimedia card (MMC) mainly because it benefitted from quick transfer speeds as well as being considerably storage making transportation that little bit easier. It's estimated that the transfer speed of SD memory is 6 times quicker than a CD Rom and this was the main reason it turned heads. A number of years after the first SD memory card produced it was revised to make it even faster.
Another advantage of the SD memory is the storage space that is possible. Whilst Multimedia cards could rarely be found over 512MB, it's possible to find memory that goes up 2GB, 4GB, 8GB and recently there have been a number of 32GB cards coming on to the market. These huge cards are able to store a whole holidays worth of pictures so reduce the need for numerous cards for each trip. Be careful, if you lose one of these cards you could end up losing a year's worth of pictures!!
SD memory disks usually need a card reader to be attached to a computer USB port in order to transfer data on to a computer. It's advisable that this is done on a regular basis as hard drives tend to be more stable and less chance of corruption than a memory card. Many modern appliances have SD memory card ports to displays pictures such as TV's and digital photo frames.
As with most things in the current climate, price played a big factor in the success of the SD card. Obviously prices vary between storage sizes and speed of transfer but as a rule of thumb SD is one of the cheapest forms of data available.
The range of SD cards now available on the market is quite astounding. It's no longer dominated by Mitsubishi and Toshiba; the big players are SanDisk, Lexar and PNY who between them make over 200 different variants! Make sure you do the correct research and make an informed decesions, although they all look the same there really is good and bad memory.
Tom Shurville is the main contributor to this website about the joys of owning a 4 GB SD Memory Card. It's full of memory card related articles including one on SD Memory card Capacity
SDXC Mega storage flash card technology at CES 2009
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