some trouble in Mac OS Tahoe filesystem

On my 2022 M2 MacBook Air, I created a password-protected dmg disk on HD Disk and it was working with Mac OS Sequoia. After the upgrade to Mac OS Tahoe, when I access the disk, I received the following error message ("Filesystem mount failed")





How Can I solve this problem?

Thank a lot.

MacBook Air

Posted on Nov 15, 2025 10:24 AM

Reply
2 replies

Nov 17, 2025 11:49 AM in response to eissad64

eissad64 wrote:

On my 2022 M2 MacBook Air, I created a password-protected dmg disk on HD Disk and it was working with Mac OS Sequoia. After the upgrade to Mac OS Tahoe, when I access the disk, I received the following error message ("Filesystem mount failed")


How Can I solve this problem?
Thank a lot.




ref: Encrypt and protect a storage device with a password in ...



ai spits this out—


[ To access a password-protected

.dmg file on macOS Tahoe, you can try opening it directly, but if it fails, you may need to access an older Mac to open it, or use a tool like Disk Utility on another Mac to decrypt it. If the .dmg file was created before upgrading to Tahoe, the upgrade may have caused compatibility issues. You can also use the Keychain Access utility to find and remove any saved passwords, which can help resolve issues where the saved password is preventing the file from opening]



Even though Apple has moved to the Passwords.app you still have the old Keychain Access.app if you need to dig around there...(?) I have no idea if this would get you any further.


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some trouble in Mac OS Tahoe filesystem

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