dealssandisk 16gb microsdhc memory card, class 4 for…

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All the cards offered add up to $14.99 shipped.

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Shows up as $15.45 for me (before shipping). edit: I see it if you click to go to the other sellers. Yep, $4.95 shipping makes this about the same price as any other day.

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@faeree: how do you figure thats a better deal?

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Class 10 plus free shipping makes it a better deal. For $5.00 more I get a better class and I'm not dealing with an Amazon 3rd party company.

Re: 3rd party vendors: I've dealt with 2 different electronic 3rd party company's via Amazon and have had major headaches with them. At least via Target I am dealing with a reliable company.

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@faeree: touche. I am a third party vendor on Amazon I would just suggest reading their feedback first because I have never had one unsatisfied customer. But I too have dealt with other bad sellers.

What is the difference in class mean though?

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The class represents the speed at which the card reads and writes. Each class has a minimum speed it must meet.

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Higher class means a higher write speed, which is good for things like cameras where you're constantly writing to the card. If you're gonna throw it in a phone or tablet and play MP3s and movies off of it then a lower class is just fine (read speed is the same or close to it between classes, IIRC).

I've got a few class 6 cards for my camera now and the write times are noticeable between pictures/videos (though not really bad, just noticeable). If you don't mind waiting a second between each shot (assuming you're shooting in a high resolution) that's fine, but if you're doing burst shots or video recording a higher class quickly becomes necessary. Class 4 cards are perfect and less expensive solutions for MP3 players, phones, tablets, etc. that you'll mainly be reading data off of and not constantly writing to.

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Class 10 vs 4 doesn't necessary mean better. Class 4 cards tend to have better random write performance which is critical in smart phones.

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The class number specifically refers to the minimum speed of the card, in megabytes per second. With the reputable brands of cards, this refers to the write speed, which is slower than the read speed. So, if you're putting the card in a digital camcorder and are going to be shooting 1080p video, there's no way a class 4 will work (4 MB/s). Though if you're going to be using the card primarily for reading, a lower class will probably be nearly identical, since most SD cards have very similar read speeds.