changing microSD card reportable memory

I have a 64gb micro sd card that is really only 3.9gb.

so, is there any way to overwrite the capacity on the card to it's real capacity.

if I format it then it says complete and in windows explorer it says 64gb.

Hwtest 1.4 tells the truth - 3.9gb.

can the microSdcard "bios" be altered?

thanks

Comments

  •  

    I don't think there's an easy way to do it, because the media is defective in the first place.
    It's also best not to use that SD card — you're running the risk of data loss by using a cheap, low quality re-badged SD card. It may stop working at any given time.

    So while it might be marked as a "Sandisk" for example in reality it's a very low quality 'reject' that came out of the factory and was rebadged as branded memory, and also hacked to falsely report it's actual capacity. Basically, it's a counterfeit item with inferior build quality.

    Toss it into the bin and buy a genuine card.

    •  

      yeah, just wondering if the 3.9gb could be salvaged so I could throw it in a cheap mp3 player for jogging.

      it is a dodgy fake. if it can be hacked to show fake capacity then why not be able to unhack it?

      •  

        so I could throw it in a cheap mp3 player for jogging.

        You could just fill it to the 3.8 gigabyte mark, then stop before any data loss occurs.

        I'm not sure if there are any hacking tools available that could change the 'apparent' capacity of the card. You could try partitioning the SD card — Simply remove the existing partition, create a new FAT32 partition that's smaller than 3.9 GB and see if the card will report that amount.

        This is a guideline (used for partitioning SD cards for Android, but in theory you could do it for an Mp3 player)
        http://forum.xda-developers.com/wiki/SD_card_partitioning
        Just make sure you pick FAT32 during the file system option.

        •  

          You could just fill it to the 3.8 gigabyte mark, then stop before any data loss occurs.

          Bad idea if the file system is not aware of this. You won't have control over if/when it will move data around.

  • +1 vote

    Just curious - where did you buy it from?

    •  

      bought from aliexpress. I knew it would be dodgy. but with the escrow service and providing screen shots of hwtest it would be good and I got my money back. aliexpress have been pretty good that way.

      though actually it was the seller who said they would refund me via paypal. and to put the sale through. so they did and I did and then left neutral feedback.

  • +1 vote

    I have played with a '50GB' usb device that was actually 8. It worked fine in writing, but when reading off the card everything past 8GB just returned 0xFF.

    Simplest solution is to create a partition at the front of the actual size to stop the rest being used. This assumes you cheap MP3 player can cope with this.

  • +1 vote

    altomic
    That fixes your dodgy deal and now leaves a neutral report for others to see and get ripped
    off again by unscrupulous dealers,and so it goes on .
    Good on ya.

    • +1 vote

      the neutral report was accompanied by appropriate feedback -something like "sd card either faulty or fake. tested with hwtest 1.4 and only showed 3.9gb usable. seller refunded money".

      if people read feedback to get an understanding of what they are getting in to then great. if people just buy the item and receive it with out testing it and leaving "excellent" feedback then not good. surprising how many people buy ludicrously cheap microsd cards and leave 5 star feedback.

      maybe some micro sd cards are genuine? surely that many people can't be so stupid as to not test what they have bought?

      •  

        maybe some micro sd cards are genuine?

        This is eBay we're talking about?

        If the seller is smart, they wouldn't sell too many counterfeit SD cards as that would mean increasing their chances of getting caught out and have their reputation tarnished.
        In that regard, simply reading their feedback history isn't enough of a preventative measure of getting something that isn't as described. It is very easy to farm positive feedback. A seller with 10,000 positive feedback but only with 100 negatives can still achieve the 99% feedback rating.

        Anyway with so many MicroSD deals popping up these days I don't see why people have to try and gamble on buying stuff from overseas eBay sellers.

        •  

          This is eBay we're talking about?

          Aliexpress.

        • +1 vote

          Aliexpress.

          They also follow the same feedback system. Again, sellers can employ the same trick as they do with eBay to mask their 'bad ratings'. They just sell lots of stuff… with a few bad apples mixed in.

  • +1 vote

    It's fake throw it out… not worth any effort or use.

    You will lose data on it and it will corrupt easily.. in fact.. go run it through a few format cycles and i'll guarantee its dead and unreadable soon.

  •  

    following article is about fixing a fake SD/SDHC memory cards but should also work on micro SD cards

    http://flashchiptech.wordpress.com/2011/07/13/fixing-fake-sd...

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