This morning, the router usb drive windows shares had stopped working. The reason was easily found: Tomato had decided to mount the usb drive as /mnt/sd[xx] instead of /mnt/[partition name], which made my defined shares invalid. Unmounting and remounting the drive several times didn't change anything. The partition name is still correct and seems to be recognized just fine, nothing changed. Tomato GUI says:
Partition 'partitionname' ext3 (687.67 GB / 412.94 GB free) is mounted on /tmp/mnt/sda1
Any ideas why that happens and how to stop it?