sorry, my poor english and uncoherent descriptions made people kinda confused.
let me make the final summary about things till now. i bet and hope this is the simplest outline to understand.
- each of my music files has a cover art inside themselves(i put it with MP3TAG.), and i tried to get it out to save by right-clicking on a music in a playlist to open menu and choosing 'cover art>save cover art to external location specified in options'.
- cover arts should have saved in C:\Users\[name]\AppData\Roaming\J River\Media Center 21\Cover Art, but they are saved in wrong location(C:\Users\[name]\AppData\Roaming\J River\Media Center 21\Temp).
- for test, i changed the cover art location to another folder(d:\) and tried again, but cover arts are still created in C:\Users\[name]\AppData\Roaming\J River\Media Center 21\Temp.
- i found out that cover arts are made in wrong location regardless of the setting of tools>options>file location>cover art:[folder location]. (of course, i also have already set this, tools>options>file location>cover art>audio mode:in a specified folder.)
# no developer has clearly replied to my post till now, but this seems to be a bug.
@ how are my private files deleted??
- when the cover art location is set to d:\ for test, i have run 'tools>options>file location>cover art>clean cover art folder'
- my private data were in d:\.
- as a result of running it, all files in d:\ except its sub-folders were unrecoverably deleted.
- this is why i suggested here(
http://yabb.jriver.com/interact/index.php?topic=104243.0) that all files in the cover art folder should not be permanently deleted and just moved to 'recycle bin' when users run 'clean cover art folder'.
@ why did i offer the suggestion for developers to make a popup come out when users change the cover art location??
- now, if users change the current cover art location to another, mc21 tries to move all files and folders to the changed location without a dialog window without users' permission.
- my original cover art location was mc21's default value(C:\Users\[name]\AppData\Roaming\J River\Media Center 21\Cover Art) and for test i once changed it to d:\ which has tones of files and folders(about 20gb).
- when i change the cover art location from d:\, mc21 started to copy all in d:\(files, folders,all files in all sub-folders) to the new location. this caused app freezing.(the cover art location change would probably be done successfully if i keep waiting until all copy process is finished no matter how long hours it takes.)
- i could never change the cover art location from d:\ until rolling all settings back with a mc library backup file(MC Library Backup(Main Library - 2016-04-08).zip) by running 'file>library>restore library'.
in this reason above, i think a dialog window is required for asking whether users also want data transfer from the previous location to be moved right before mc21 performs changing cover art location.