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Thread: Help With SD card Options

  1. #11
    tz1
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    Quote Originally Posted by NoStopN View Post
    So occasionally, SD cards should be reformatted every so often? I'll have to keep that in mind. Is there a way to do that with a PC? My digital camera is the only thing I know of that has actually said anything involving formatting.
    Panasonic has a utility - a bit slow and sometimes it says it can't do the erase command. SD Memory Card Formatting Software | SD Memory Card | Digital AV | Consumer Products | Support | Panasonic Global

    The difference between an ordinary format and a true erase is internal. Inside the SD are large arrays of flash that all have to be erased at the same time. Normally there are some spares, but if you change one sector in an already allocated block, and there are no blocks with erased sectors it has to shuffle the data around to write the data. That is why it slows down as it fills up. A true erase blanks all the sectors so it goes at full speed again. Newer cards have better algorithms, but they are all Class 10 or SDXC or otherwise very new - my older cards need this true erase.

    Also it doesn't just become linearly slow - they tend to go at a normal speed for seconds or minutes, then start taking 1/4 of a second to write a few sectors. That is usually the killer as the device often doesn't have memory to buffer that much.

    Most devices (like a camera) when you tell it to format the card does one of these true erase cycles.

    On a PC you need the special utility.

    The tablet might have an "erase SD card" which might or might not do a true erase.

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  3. #12
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    Quote Originally Posted by tz1 View Post
    Panasonic has a utility - a bit slow and sometimes it says it can't do the erase command. SD Memory Card Formatting Software | SD Memory Card | Digital AV | Consumer Products | Support | Panasonic Global

    The difference between an ordinary format and a true erase is internal. Inside the SD are large arrays of flash that all have to be erased at the same time. Normally there are some spares, but if you change one sector in an already allocated block, and there are no blocks with erased sectors it has to shuffle the data around to write the data. That is why it slows down as it fills up. A true erase blanks all the sectors so it goes at full speed again. Newer cards have better algorithms, but they are all Class 10 or SDXC or otherwise very new - my older cards need this true erase.

    Also it doesn't just become linearly slow - they tend to go at a normal speed for seconds or minutes, then start taking 1/4 of a second to write a few sectors. That is usually the killer as the device often doesn't have memory to buffer that much.

    Most devices (like a camera) when you tell it to format the card does one of these true erase cycles.

    On a PC you need the special utility.

    The tablet might have an "erase SD card" which might or might not do a true erase.
    Take a look here :

    SD Formatter 3.0 for SD/SDHC/SDXC - SD Association

    Hope this helps.

  4. #13
    RKL
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    How can one format an SD Card on the Thrive? Can't seem to find a way to do it. Thanks in advance.

  5. #14
    tz1
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    Quote Originally Posted by RKL View Post
    How can one format an SD Card on the Thrive? Can't seem to find a way to do it. Thanks in advance.
    I don't think it is possible (sans root). That said, you can delete all the files. Otherwise use a PC (and the SDFormatter above). Or a Mac - they support exFAT for 64G+

  6. #15
    RKL
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    Thanks.

  7. #16
    Thrive Informant
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    I bought a Transend from Amizon fo $50 no problems 32gb class10


 
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