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  1. #1

    Sandisk SD Card problem

    I bought a 'Sandisk Ultra 128GB' SD card. When I tried to use it, Windows says it needs formatting. It then said the card is only '31MB' in size. So I didn't format it. Instead I downloaded other formatting/partition tools to try and fix the problem. Unfortunately nothing will format it and display the correct size of the card. Even Windows says it can't format it. I've tested it on two different Win7 PCs that recognise all my other Sandisk cards.

    Before I send it back to Mymemory, I just want to check if anybody knows a solution to this problem?
    Last edited by Leon Retro; 27-09-2018 at 05:00 AM.

  2. #2

  3. #3
    Quote Originally Posted by Jaz View Post
    Sounds like a fake card?
    I made sure to buy it from 'Mymemory' which I've used a lot in the past. I know that eBay and Amazon sellers sometimes sell fake cards so I used a company I trust.

    I guess it's just a case of bad luck. I can return the card Freepost with a returns slip, so I know I'll get a refund.

    I had a look around for info and some people have had this problem with Sandisk cards, so I might go for a Samsung card instead, seeing people are now saying Samsung are better than Sandisk.

  4. #4
    It's not a fake card. All you need to do is download SD Card Formatter.

    If you've been using images (such as Pi images) Windows can only read the boot partition, not the ext3/4 formats.

    Download that, select the right drive letter and quick format, click the format button and you'll have all the space again.
    Last edited by MartyG; 27-09-2018 at 07:07 AM.

  5. #5
    MartyG's very likely right. Just googling 'Sandisk sd card 31MB' is getting loads of results(often recommending SD card formatter).

    My own Sandisk EVO 32GB microSD did the same thing - showed up as 31MB - after I was playing around with it on the Wii. Running diskpart and using the clean command didn't help, but the SD card formatter did. Still working fine two years later.

    Fake cards would still hold a reasonable amount of data beyond 31MB because they're probably not using 32MB chips, more like 1-2GB or whatever's cheap at the time.
    Last edited by randombs; 27-09-2018 at 08:31 AM.

  6. #6
    Quote Originally Posted by MartyG View Post
    It's not a fake card. All you need to do is download SD Card Formatter.

    If you've been using images (such as Pi images) Windows can only read the boot partition, not the ext3/4 formats.

    Download that, select the right drive letter and quick format, click the format button and you'll have all the space again.
    I hadn't used the SD card, Windows said there's a problem with it as soon as I inserted it. I've never had this problem with loads of other Sandisk cards I've used over the years.

    I downloaded 'SD Card Formatter', but it says "Formatting failed" which is the same error I get with other formatting programs. This happens on two computers which accept other Sandisk cards, so the card must be a dud.

    Quote Originally Posted by randombs View Post
    Fake cards would still hold a reasonable amount of data beyond 31MB because they're probably not using 32MB chips, more like 1-2GB or whatever's cheap at the time.
    Yeah, it's probably not fake, seeing it came from a legit company and was packaged like you'd expect. I'll send it back and buy a Samsung card instead. Maybe Sandisk's quality control has had problems? I've read that Samsung cards are now the better choice anyway, so I'll go for one of them.

  7. #7
    Quote Originally Posted by Leon Retro View Post
    I hadn't used the SD card, Windows said there's a problem with it as soon as I inserted it. I've never had this problem with loads of other Sandisk cards I've used over the years.

    I downloaded 'SD Card Formatter', but it says "Formatting failed" which is the same error I get with other formatting programs. This happens on two computers which accept other Sandisk cards, so the card must be a dud.



    Yeah, it's probably not fake, seeing it came from a legit company and was packaged like you'd expect. I'll send it back and buy a Samsung card instead. Maybe Sandisk's quality control has had problems? I've read that Samsung cards are now the better choice anyway, so I'll go for one of them.
    This is what happens when you live in Shanghai half the year - see an SD card, KNOW it's fake

  8. #8
    Yeah, get it changed if you’re in no mood to faff about. I think mine also failed a few times and I started the return process but then I got it going. Can’t remember how, but I may have used a MacBook with the built-in SD card reader. Might be worth trying something other than Windows if you haven’t already.

  9. #9

  10. #10
    Worth a try, but SD Card Formatter does things at a lower level than a simple disc format so if that isn't working then it sounds more like a duff card.

    I didn't realise that this was a brand new card fresh from the packaging.

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