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These readers are very small, you can fasten them onto your keyring, and store all your import files onto them. I have two of these, a red one and a gray one. There is no difference between them apart from the colour. If in the future you want to store larger files just pop in a bigger micro-sd card. Speed wise it depends on the card that you put into it as it is just a reader, the 8gb that comes with this is OK, its a class 4, which means it will take you about a minute to copy over a 200mb file. I have a 32gb in my red one now so i can store some blue-ray movies on it to watch on my streamer. Just be careful what you put this into, if a friends laptop has a virus, your likely to get it onto this and there is no switch on this to make it read only. Apart from that, it is cheap, tiny, and does the job well. What more can you ask for.
For mobile phone enthusiasts who frequently exchange large media files between their PC and multimedia phone, the SanDisk Mobile Ultra line of high performance memory cards provides ultra fast and ultra convenient, high-capacity solutions to shorten the time you spend managing your music, videos, photos, and games for your phone.