Quoting Fernando J. Rodríguez (groucho@lugmen.org.ar): > Please consider: > a) changing the erase algorithm for someting more expeditive, even at the expense of some > effectiveness; > b) asking the user if she actually wants to erase the contents of the newly created volume; > c) warning the user that the erasing could take more than 1 day. The option exists but is not asked during guided partitioning with encryption, precisely to keep guided partitioning as a straightforward option and not something "asking questions". If you want to use an encrypted partition without erasing the data on it priori to this, you have to choose manual partitioning.
Attachment:
signature.asc
Description: Digital signature