Those not following TiVo hacking may want to gloss over this one, but it would appear that the latest version of spike2k5's MFSLive TiVo volume hacking tool (v1.2) enables support for both internal and external expansion. (Remember, you were bound to run into trouble if you tried the Series3 eSATA drive expansion technique if your internal drive was already upgraded.) We haven't given this a go -- any luck for you peeps?
[Thanks, Bill S.]
Read - MFSLive v1.2 release notes
Read - MFSLive download page