videocon d2h hd dvr is not a failure so better not comment if u do not know, currently its only available in select cities just like tata sky hd dvr was available in select cities when launched, its availability will slowly be increased
tata sky promoted hd dvr bcoz they do not have usb recording facility in hd stb, they want to make high profits by selling hd dvr. take this simple case , if a customer buys a hd stb and then attaches a 1TB hard disk to it for recording, it will all come at approximately Rs 7500 to max but tata sky is selling half its capacity 500GB HD DVr at about Rs 6500 , this is the reason why tata sky does not want to activate usb recording on hd stb while videocon d2h is not greedy like them and will activate usb recording on all hd stb and soon on sd stb