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I am having a problem with an external HFS+ USB drive on a MacBook Pro running High Sierra:

When I plug the drive into the computer, it gets automatically mounted as read-only. I have to manually remount it to make it read-write:

sudo mount -u -w -v /Volumes/hdd

However, if I plug the same drive into my older MacBook Pro running Mountain Lion, the drive is mounted read-write as expected.

I have erased (formatted) the disk many times over, and also tried diskutil verifyDisk and diskutil verifyVolume, everything seems clean.

Any ideas on how to troubleshoot / fix this problem?

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