If you add album artwork to a particular album, all the correspending songs increase in their size (as the artwork gets added to each individual track). However, if you undo this action, the individual track size remains at the artwork-existing level (thus, no reduction of track size by removing the artwork occurs). If you have some 100 GB of music, this adds up to several hundred megabytes. I am not aware if this still occurs in 7.1.1., but it definitly did in 7.x.x (last time I tried was in the middle of last year). Any workarounds?