Originally Posted by wttwoa
if i drag and drop all of my library, would it keep the organization into the sub folders?
I maintain all my books in a complex folder structure, several levels deep, on a Windows PC. Every so often I use FreeFileSync freeware to synchronise both a 16GB SD card and the Memory of my Nook Simple Touch. The folder structure is reproduced on my Nook. It works well.
I see no reason to use Calibre, apart from the odd conversion of a problematic eBook.