TV dramas continue to benefit the most from the DVR revolution, Variety reports. It was mostly the biggest shows, — Grey’s Anatomy, CSI, The Mentalist, and House — that gained even more viewers when digital recorder playback is added, according to premiere-week Nielsen statistics. The biggest comedy gainers included The Office and Big Bang Theory. Unfortunately, DVRs didn’t help struggling NBC much, as a huge swath of its schedule includes time-sensitive viewing such as The Jay Leno Show and Sunday Night Football. Overall, DVR usage continued to rise, with penetration rising from 33 percent to 38 percent year-to-year in adults 18-49. Thursday’s the hottest night to record, and sci-fi’s the hottest genre (Heroes, Fringe, and FlashForward are all big gainers). Struggling freshmen such as Fox’s Brothers and CBS’ Accidentally on Purpose didn’t grow much with DVR usage. By network, Fox saw the biggest jump in ratings when playback was added, followed by ABC and CBS, then The CW, then NBC.