Here is the proof that it's actually there.

TiVo: /var/tmp#echo mls /SwSystem | tivosh
Directory of /SwSystem starting at ''

Name Type FsId Date Time Size
---- ---- ---- ---- ---- ----
3.5c-01-1-001 tyDb 4110482 09/06/07 23:41 708
3.5d-01-1-001 tyDb 5226744 05/15/08 06:32 684
ACTIVE tyDb 4110482 09/06/07 23:41 708