I had a NAS with 300GB data stored on it. I played around with it and finally broke it - all of the data was lost. I opened the NAS and put the disk into my computer (running Ubuntu). I put new data on it (about 80GB) and then realized that the old data still seems to be taking up space:
df -h /dev/sdb1 1.3T 379G 899G 30% /media/nasHD
Is there an easy way to recover this data? If not, how can I free the space?