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  1. My car's GPS is updated by SDHC card, now at version 11. Packaging states, "Warning! The card in this package is write protected. It cannot be used in any other device."

    I have older versions 6 & 9 SDHCs (all FAT32) I would like to reuse, but the Warning seems to be true--so far.

    "Properties (ReadyBoost): The device is mounted read-only. This usually happens with write-protected devices/media or when BitLocker group policy settings prohibit write access to non-encrypted removable devices."

    I've tried using diskpart & regedit fixes often suggested, after confirming the write-protect switch is at "off." None work.

    BitLocker doesn't seem to be a factor, based on other utilities' analyses.

    I hate to toss an otherwise good SDHC that's readable in my Win10 PC and other devices.


    Any other options?
    Last edited by CobraPilot; 6th May 2021 at 13:30. Reason: Typo
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  2. Member
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    try this - with the card connected to your windows pc open the command prompt (cmd)
    type diskpart and hit enter, Type the following command and hit Enter each time: list disk, select disk # (# is the number of your write-protected SD card.) attributes disk clear readonly wait for the process to complete - https://www.easeus.com/partition-master/how-to-format-a-write-protected-sd-card.html
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  3. Member netmask56's Avatar
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    If you have access to a MAC or Linux machine sometimes reformatting it in those devices will work. Did that years ago in my then Linux media player for a card like that. Then reformatted again in my PC
    SONY 75" Full array 200Hz LED TV, Yamaha A1070 amp, Zidoo UHD3000, BeyonWiz PVR V2 (Enigma2 clone), Chromecast, Windows 11 Professional, QNAP NAS TS851
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    On Windows, try HPUSBDisk https://download.cnet.com/HP-USB-Disk-Storage-Format-Tool/3000-2094_4-10974082.html. It's meant to force format flash drives, but I've used it on SD cards in a USB adapter. I have to Run as administrator on Win 10.
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  5. Originally Posted by october262 View Post
    try this - with the card connected to your windows pc open the command prompt (cmd)
    type diskpart and hit enter, Type the following command and hit Enter each time: list disk, select disk # (# is the number of your write-protected SD card.) attributes disk clear readonly wait for the process to complete - https://www.easeus.com/partition-master/how-to-format-a-write-protected-sd-card.html
    Alas, doesn't work, and neither does the Partition-Master utility.
    Last edited by CobraPilot; 8th May 2021 at 12:30. Reason: Add'l comment
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  6. Originally Posted by lingyi View Post
    On Windows, try HPUSBDisk https://download.cnet.com/HP-USB-Disk-Storage-Format-Tool/3000-2094_4-10974082.html. It's meant to force format flash drives, but I've used it on SD cards in a USB adapter. I have to Run as administrator on Win 10.
    After use, gives an immediate "disk is write-protected."

    This SDHC seems to have some heavy-duty write protection!
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