[galaxy-dev] purge and delete data

Dear Galaxy developers,

I just started to configure and use Galaxy, and I don't really understand how we can delete/purge data from the disk. I delete several dataset or libraries from the admin interface and then run the script/cleanup_datasets scripts as explained in https://bitbucket.org/galaxy/galaxy-central/wiki/Config/PurgeHistoriesAndDat... (with the -d0 option)

From the interface my libraries are flagged purged as expected ... but

on the disk I still have the files ! how can I remove these files from the disk ? Another question, the purged libraries are still available through the advanced search - deleted, how can I completely remove these libraries from Galaxy ?

Thanks for your help, Regards,

Nicolas