Read-only RedHat VM Filesystem

I restored a RedHat VirtualBox VM from a colleague. I installed the VirtualBox extensions, changed some files on the box and rebooted. Everything went back. Tried again. Never changed. Made a snapshot. No difference.

After a little googling, found this article. Could the file system be read-only?

mount -o remount,rw /VolumeXXXXX /

It sticks. Something in the VM preparation changed the filesystem. Weird.

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