512MB MMC card set read only state?

Discussion in 'Digital Cameras' started by Pekka, Feb 27, 2005.

  1. Pekka

    Pekka Guest


    Please help me, I'm running out of options...

    I took photos with my Minolta G400 digital camera to 512Mb MMC card and
    suddenly it said "SD error" and camera shut power off. G400 didn't read the
    card at all. The card has been working fine the last few months.

    I switched the card in my pc card reader. With windows 2000 pc, I could
    transfer all old pictures, but all new pictures, taken today, were
    corrupted. When I try to format the card it does not succeed, and I can't
    transfer any data to the card either.

    Then I tried to use Linux and mount the card, but still no success. Linux
    says that the card is read only when I try to copy data to it.

    I know that mmc cards (and SD card also) contains controller and memory
    chip. The controller contains security registers where the card can be
    protected etc. It seems that my mmc card controller has switched read only
    bit on. In mmc and SD card specifications say that there are one command
    "forced erase", that reset the card controller and erases the whole memory,
    and after that the card would be usable again (it resets forgotten password
    also). But the problem is that I don't know how to give that command to the
    card, because apparently the normal format does not do it.

    I would be very happy if someone could help me to open the card because it
    cost over 60 euros and I dont want to spent more before I know all options.

    Br. Pekka
    Pekka, Feb 27, 2005
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  2. Pekka

    clutch Guest


    Does a MMC card have a write protect switch? If so, try cycling it in
    case the connection went bad.

    clutch, Feb 27, 2005
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  3. Pekka

    NoOne Guest

    I top post 'cos I'm like that !

    Try PC INSPECTOR Smart Recovery
    It's somewhere on http://www.convar.de

    Mine came off a cover disc, can't remember which

    NoOne, Feb 27, 2005
  4. Pekka

    Pekka Guest

    Thank you for the hint, but I already tried it.

    Pc inspector can read files (also previously deleted files) from the card
    even I formatted it several times. The problem is that the card seems to be
    write protected and I can't even format it. I tried several this kind of
    utilities, but no luck, even partition managers says that the disk is write

    and this is MMC card not SD where is write protect switch.....

    There should be some utility in somewhere to reset the card controller or to
    set write bit on, because the memory seems to be working, because utilities
    can read data from the card.

    Pekka, Feb 27, 2005
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