After moving iTunes, external drive sometimes becomes read-only after reboot

I had some system corruption a few weeks ago, and had to restore my system.  As part of that prolonged effort, I decided to move my iPhoto Library and iTunes Library to external FW800 drives.
I had terrible problems initially with these drives mounting read-only.  I found a relatively quick work-around, and that seemed to fix the problem.  But I still have them periodically mount read-only, and I can't D/L iTunes updates, etc.
Why do they keep doing this on a reboot?  Very frustrating, as I need to reboot as part of the fix, and I'm always in the middle of something else, and can't reboot at that time.

Oh, as part of this, not sure when the change was made, OSX used to keep the mounted volume name in /Volumes, even if the volume was ejected.  Would cause an occasional problem - but very rare.  I notice now that ML seems to create/delete these mountpoints automagically - and that's part of the problem.  They get incorrect permissions when the volume mounts, and I (user I'm logged in as), can't write to the volume without some background shenanigans.
My process is this:
Unmount problem volume
Drop to terminal, and "sudo mkdir /Volumes/<mounted_volume_name>"
Remount volume via Disk Utility (you now get a "<mounted_volume_name> 1" - with CORRECT permissions)
Unmount the volume again
Remove the created directory (i.e. undo step 2)
Remount the volume - 99.9% of the time that seems to fix it.
Reboot to be sure - and it stays for a while - then at some point becomes a problem again.
Not sure if it's something in ML that's an issue - or something in iTunes or iPhoto (but can't see how they would affect the permissions when the system reboots and you login)

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