Is that a big problem or does it sort out your problem?
Yes. it's a big problem. Almost 6TB to remove from one HD to other needs about 24h nonstop (eSATA 70MB/s). And free zone decreases every day.
I'd like to have speed, don't loose place and to have comatibility (windows). Yeee... It's a problem.. So Ive decided to use ext4 but without clusters (bigalloc).