OSD: where is a task sequence in full os stored?

Hi,

Please see http://social.technet.microsoft.com/Forums/en-US/187b13a9-e05c-47a1-9129-66f8e4546a1e/osd-upgrade-bitlockered-os?forum=configmanagersecurity

Regarding that question I'd like to know: the winpe is prestaged to disk, we can boot but not read the task sequence.
So a general question: in OSD (when loaded in full OS) where is the winpe image stored on disk (encrypted in my case) and where is the task sequence stored on disk?

J.

Jan Hoedt