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savante Author

Level 1

8 points

Volume being mounted twice, showing up in finder as "Read Only"

I have an external buffalo drive.

Since updating its filesystem to APFS, it began mounting 2 versions of the drive.

One called "Buffalo 1TB" and one called "Buffalo 1TB - Data".

As far as I can tell, they are identical except that "Buffalo 1TB" is mounted as a read only filesystem.

The volume with the "- Data" on it, is read/write... but in Finder, only the read-only file system is being displayed.

Going to disk utility I see the screen shots attached.

I would like to eliminate the duplicate mounting and make sure the only mounted version of the filesystem is R+W. Can anyone assist?

MacBook Pro 16″, macOS 12.0

Posted on Jan 13, 2022 8:23 AM

Best reply

lllaass

Level 10

210,423 points

Posted on Jan 13, 2022 8:38 AM

Are you booting from the external Buffalo drive? It appears to be a startup disk

It is not a duplicate. The read only is a sealed volume of the basic operating system and can't be changed by the user. The Data one is that one that is read-right. The non-data one does not show in Finder

Also see:

https://eclecticlight.co/2021/01/09/boot-disk-layout-on-intel-and-m1-macs-high-sierra-to-big-sur/

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Volume being mounted twice, showing up in finder as "Read Only"

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