Hi all, First I would like to thank you for your fast replies to my questions. As you know, at top right corner of Galaxy window, there are records of the history size and how many percentage of memory space has been used. I found that the number in the records only increases, but doesn't decrease after I delete files permanently. DId I miss something? How to let the record show the real size of the histories? Thanks in advance. Greetings, Jiwen ___________________________________________________________ The Galaxy User list should be used for the discussion of Galaxy analysis and other features on the public server at usegalaxy.org. Please keep all replies on the list by using "reply all" in your mail client. For discussion of local Galaxy instances and the Galaxy source code, please use the Galaxy Development list: http://lists.bx.psu.edu/listinfo/galaxy-dev To manage your subscriptions to this and other Galaxy lists, please use the interface at: http://lists.bx.psu.edu/