Just looked inside the 'formatted' mydocs, everythig is still there, sudo fdisk and mkfs.vfat is next! and that worked perfectly as a format but failed to make the directory writable...
I was mistaken the stuff I saw in MyDocs was was just the video clips, audio clips, documents, etc auto-added by the N900.
So WTF!? it was formatted, mounts rw, but still cant write as a user??