With Disk Based storage, nothing is more accessible, few solutions are cheaper, fewer are faster and fewer still are more reliable. Consider your HD-TV needs and you will begin to realize that Disk Based solutions are all but mandatory.
The new Tera Store 72, when raided gives you 56 TBytes of raid 6 storage. If you encode video at HD 50 Mbps, then you can store over 2500 hours of video. Almost 16,000 hours at 8Mbps. That's almost 2 Million 30 second spots.
Regardless, in the new digital environment where stations are going multi-channel, tape just doesn't cut it. You have to go Disk Based. With the economy the way it is, you have to do more with less and NVerzion and Tera Store fit this perfectly.