Time Machine won't backup my external drive

I have my iTunes library stored on an external drive and I want Time Machine to back it up.
I have a brand new TM drive. I've been using it without problems to backup my 250Gb iMac. As soon as I add the external drive to the TM backup, it fails. I have other data on this drive that I don't need backed up, so I've only included the sub directory iTunes (by excluding all the others).
I followed a couple of similar threads, but the situations don't seem to apply. I did install Time Machine buddy so I could see the error messages.
Starting standard backup
Backing up to: /Volumes/Time Machine/Backups.backupdb
Node requires deep traversal:/Volumes/Music:DVDs reason:must scan subdirs|
No pre-backup thinning needed: 151.31 GB requested (including padding), 1.56 TB available
Error: (2) setxattr for key:com.apple.backupd.SnapshotVolumeUUID path:/Volumes/Time Machine/Backups.backupdb/Tori's iMac/2009-11-25-182722.inProgress/3B5DD274-5AB6-44D1-9F1B-561934FB44AD/Music/DV Ds size:37
Stopping backup.
Copied 0 files (0 bytes) from volume Music/DVDs.
Copy stage failed with error:11
Backup failed with error: 11
Drives are all formatted OS Extended Journaled
I've run Disk Util on all the drives - no errors.
Any ideas or other things I should try?
If I remove the external drive from the backup, it starts to work again.

The mystery deepens . . .
I tried to replicate the problem. Renamed an empty partition from Misc2 to Misc2/test and copied some docs into it and ran a backup.
Sure enough, the message refers to it as Misc2:test and the deep traversal took almost a minute and a half (one folder, 3 sub-folders, total of about 30 items!), but it ran successfully.
So renamed it again, to Music/DVDs exactly like yours. No deep traversal, and it does call it Music:DVDs in the messages, but it backed-up properly.
Perhaps it was fixed in Snow Leopard? Or just another of TM's many little quirks? Perhaps the phase of the moon?
Edit: Some of your posts say you're on 10.5.3, others 10.6.2. Which is correct?
Message was edited by: Pondini

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