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Post your SD card read/write speedsGeneral

Last Updated:


    FLAWLESSVW Well-Known Member

    I'm curious what you guys are seeing for SD r/w speeds. I recently "upgraded" to a SanDisk Ultra 32gb Class-10 (UHS-1) which is supposed to be screaming fast. I bought it from a reputable retailer (Micro Center) and have tried two of the same card so far after seeing less than stellar results with the first card and exchanging.

    I'm seeing approx
    3.5mbps write
    7.5mbps read

    This card should be pushing more than that. To test I've used:
    SD Tools
    SD Card Tester

    I've formatted in various methods which made no improvement (in the first card... See below) I know our devices have limitations but I would think it should do better than that?

    Trying to see if my device is having issues, or if I've gotten 2 bad cards (bad batch, fakes?) or something else is up?

    Lemme know:
    Card make and class
    Tool used to test
    How your card is formatted.

    Interesting note, I tested the first card in my PC and got bad speeds too. Haven't tested this one in PC yet, wanted to get this thread kicked off since I'm tearing my hair out with my supposed top of the line card :/

  2. Codegerm

    Codegerm Well-Known Member

    I have a Sandisk Ultra 16gig class 10

    With SD tools I get
    6.7 MB/s write
    8.8 MB/s read
    format is the way the phone does it (used the phones format utility)

    Now on the internal SD card (phone's usb storage) the speeds are awesome
    22.3 MB/s write
    52.3 MB/s read

    FLAWLESSVW likes this.

    FLAWLESSVW Well-Known Member

    Yeah I can't get to 8.
    CG, your SanDisk Ultra is the all black one that's just Class 10 (not UHS-1) right?

    Mine is the red and gray one pictured here http://www.amazon.com/gp/aw/d/B007XZM6VG

    I'm wondering if our phone doesn't play nicely with the UHS-1 flavor? I can't see a reason to pay $32 if the speeds are like class 6. I'm going to return it again and grab a basic class 10 and see what happens.

    I do want something that will handle shooting 1080p smoothly. Will keep you posted.

    Meantime let's see some more test results!
  4. Codegerm

    Codegerm Well-Known Member

    No, mine is grey red on top. I also got it in the camera department at best buy instead of the sd cards by the cellphones. I did that for two reasons, first is speed is more of a requirement on the cameras and video camera equipment, and second is that strangely enough the cards cost less than the ones in the cellphone area (which is so odd)

    FLAWLESSVW Well-Known Member


    Is it a UHS-1 rated card though? See the logo on my card in the link above. Supposedly UHS-1 is the next step above Class 10 (like 30mbps).

    I also got mine from the camera section @ Micro Center and agree with your logic.

    I may check to see if they have a Class 10 in the same card (non UHS-1) to test.
  6. Codegerm

    Codegerm Well-Known Member

    Yes just like yours except mine is only 16 gig
  7. janathan

    janathan Well-Known Member

    i have same card 16 gb, 7.8mbps write, 8.0 mbps read.
    i think its more with how much bandwidth the phone can use. i m sure u will get higher speeds if u check sd card speed connected to your usb 3.0 slot on PC.
    FLAWLESSVW likes this.
  8. Codegerm

    Codegerm Well-Known Member

    Your IO scheduler will have an affect on it too
  9. Montoya

    Montoya Active Member


    FLAWLESSVW Well-Known Member

    Hey CG I forgot to report back... Remember a couple months ago I posted about the couple second delay when turning the phone on from sleep and that I found it had gone away when I took out my generic class4 sd card?

    Incidentally, I started using my SanDisk (I'm ok with the 7mb speeds I'm getting after formatting internally) and that 2-2.5 second delay is gone. That sd card was for sure slowing my phone down when waking from sleep and the SanDisk doesn't seem to. I've only been testing for a day but it seems fine now :screwy:
  11. techmanc

    techmanc Well-Known Member

  12. freesunshine

    freesunshine Well-Known Member

    FLAWLESSVW likes this.

    FLAWLESSVW Well-Known Member

    Ok I'm feeling better seeing that I'm in the ballpark after looking at a lot of these results. I appreciate you guys giving feedback on this (and saving me endless trips back to the store to exchange my card!)

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