SD Card write speeds?

Discussion in 'Android Tablet Q&A' started by estra, Aug 9, 2012.

  1. estra

    estra Member

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    Hello,

    My tablet has the standard SD card slot and I'm just wondering if write speeds are important when using SD cards on tablets. For example:

    Amazon.com: SanDisk 32GB SDHC Flash Memory Card (SDSDB-032G-B35): Electronics
    or
    Amazon.com: SanDisk Extreme 32GB 30MB/s SDHC Flash Memory Card (SDSDX-032G-X46): Electronics

    What's the better buy between the two? Am I going to be okay with the normal blue Sandisk SD card or does the 45 mb/s from the Sandisk Extreme actually does something for tablets?
     
  2. Spider

    Spider Administrator Staff Member

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    As long as you get a class 4 or higher SD card, you should not have a problem.
     
  3. vampirefo.

    vampirefo. Senior Member Developer

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    The higher the class the faster the transfer of data. I buy class 10 myself.
     
  4. mugglesquop

    mugglesquop Member

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    as Spider said, Class 4 is reasonable, any lower than that and programs (if running off SD) can hang and you will just get annoyed with the time it takes to do things.
     
  5. driftinganomaly

    driftinganomaly Member

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    I picked up a Pny class 10 16GB card at Staples for $20 last night. It isn't the best, but a pretty good deal for the price.
     
  6. vampirefo.

    vampirefo. Senior Member Developer

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    I use these Newegg.com - ADATA 16GB Class 10 Micro SDHC Flash Card with SD adaptor Model AUSDH16GCL10-RA1

    They are cheap and do what I want with them, I mainly run my tablets from them, make three partitions on them 1GB for system, 4GB for data the rest for sdcard.

    busybox df -h
    Filesystem Size Used Available Use% Mounted on
    tmpfs 407.1M 44.0K 407.1M 0% /dev
    tmpfs 407.1M 0 407.1M 0% /mnt/asec
    tmpfs 407.1M 0 407.1M 0% /mnt/obb
    /dev/block/mmcblk0p3 1.4G 253.7M 1.2G 18% /system
    /dev/block/mmcblk0p2 3.9G 512.7M 3.2G 13% /data
    /dev/block/nandh 252.0M 4.1M 247.8M 2% /cache
    /dev/block/vold/179:1 10.0G 2.1G 7.9G 21% /mnt/extsd/179_1
    /dev/block/vold/93:64 2.1G 1.1G 1.1G 50% /mnt/sdcard
    /dev/block/vold/93:64 2.1G 1.1G 1.1G 50% /mnt/secure/asec
     
  7. driftinganomaly

    driftinganomaly Member

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    Those cards are a nice deal. The reviews say that they die after about 6 months of regular use. The Pny has similar problems reported. I am running a Samsung class 10 atm with 24MB/s read & 21MB/s write. (after reading the reviews on the Pny, I decided not to use it for now.)
    Thanks to your directions and boot image (and rom) , I am running my tablet from a partitioned card as well.
     

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