@
Daria - Sounds like you want to set the path in
Preferences->Saving books to disk, and have it use that one automatically when you save a book until you change it? I don't see anything there or in Tweaks - you could make a request here ==>>
Bugs : calibre
On Win7/NTFS/calibre 2.6 when I type 'S' on a book I'm
offered the last location I saved to within and between calibre sessions - not sure about between reboots. Don't recall doing anything 'special' to make that happen.
BR