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I'm using the following command to mount my folder in VirtualBox:

sudo \mount -t vboxsf -o rw -o uid=1000 -o gid=1000 Dropbox ~/Dropbox/

However, the folder is read-only. I re-installed Guest additions, and made sure the folder is not set as read-only in VirtualBox.

What's the right command to gain write permissions?

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Got it! The right command is: sudo mount -t vboxsf -o rw -o uid=1000 -o gid=1000 -o dmode=755 -o fmode=755 Dropbox ~/Dropbox/ Thanks for who tried to help :) – The Quantum Physicist May 21 '12 at 14:55

The right command is:

sudo mount -t vboxsf -o rw,uid=1000,gid=1000,dmode=755,fmode=644 Dropbox ~/Dropbox/ 

Notice the fmode.

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Thanks, It works! – adam.cajf Jul 25 '15 at 19:48

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