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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 12:30. 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 7 Ultimate, 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 11:30. 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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