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Thread: what speed microSD card?

  1. #1
    Soundwave
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    what speed microSD card?

    Is there a top speed that the transformer can handle?

  2. #2
    Soundwave
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    Quote Originally Posted by ZeroZero View Post
    Is there a top speed that the transformer can handle?
    The highest I have seen used is class 10, but I am not aware of a class higher than that.
    ----------
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  3. #3
    Starscream
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    I think the TF microSD slot is rated at 2x. I recall someone on xda developer's forum stating that when they book the TF apart. But I have no way to verify that.

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    Quote Originally Posted by ZeroZero View Post
    Is there a top speed that the transformer can handle?
    If you mean what is the fastest the transformer can read / write to a micro SDHC, I don't think anyone has ever found out. I don't recall any xda developer article, but it is a safe bet that it is definitely faster than a "2x" (which I assume means Class 2). You won't be able to tell that from a teardown anyway.

    If you mean whether there is a speed class which the transformer cannot support, the answer is no. It may not be able to take full advantage of the speed, but it will read / write to it just fine.

    I'm not sure how you intend to use the card, but if you're copying files into it from your computer, and reading it from the card, a faster speed class will save you some time when you're copying files into the card.

  5. #5
    Jazz
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    I have a class 4 card which works fine for streaming movies. My colleague loaned me a class 10 the other day and it was significantly quicker when copying files.

  6. #6
    Soundwave
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    Thanks people

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    Starscream
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    Quote Originally Posted by theimmc View Post
    If you mean what is the fastest the transformer can read / write to a micro SDHC, I don't think anyone has ever found out. I don't recall any xda developer article, but it is a safe bet that it is definitely faster than a "2x" (which I assume means Class 2). You won't be able to tell that from a teardown anyway.

    If you mean whether there is a speed class which the transformer cannot support, the answer is no. It may not be able to take full advantage of the speed, but it will read / write to it just fine.

    I'm not sure how you intend to use the card, but if you're copying files into it from your computer, and reading it from the card, a faster speed class will save you some time when you're copying files into the card.
    2x means 2 times faster than cdrom, i.e. 2.4Mbits/s while class 2 means 2 MBytes/s

    I don't know how the xda dev can conclude that microSD controller can only do 2x. 2x -> 2400kbits/s -> 600kHz clock speed -> very very very slooooooooooooow. Only SDIO devices (printer, temp sensor and controllers) run at such clock speed, 400kHz.

    btw, there are 2 different things which determine the speed from the usage pov. The interface speed which is negotiated between the host controller and the card: clock from 400kHz to 50MHz, data from 1bit to 4bit (SD is limited to 4bits, eMMC can do 8bits per clock). Most (if not all) sd card now a day can do 4bits/clock at 50MHz. Then there's the internal flash speed: how fast the card can write data into its internal nand flash, this determines the "Class X" classification of the card.
    theimmc and lotust like this.

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    Class 4 will do just about anything you need it to do. Some members have a class 10 installed. If you are just going to stream music or movies the class 4 is fine. If your going to transfer large files then the faster the better. But the faster you go the more expensive the card.

  9. #9
    Shockwave
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    my curiosity was aroused on this thread. so does this mean that you only gain advantage on higher class ratings for mSd cards which transferring to and from the Desktop/Laptop and not when inserted on the TF?
    HTC Desire HD running on 2.3.3
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  10. #10
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    Quote Originally Posted by markjeff View Post
    my curiosity was aroused on this thread. so does this mean that you only gain advantage on higher class ratings for mSd cards which transferring to and from the Desktop/Laptop and not when inserted on the TF?
    If you have a class 10 inserted in the TF your transfer rate will be faster then a class 4

 

 
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