Hard disk based time shifting is how TV stations have been doing instant replays and slo-mos since the 80s: from: http://www.tvtechnology.com/features/Media-Server-Tech/a_from_tape_to_disk.shtml COMPLIMENTARY COMPOSITING From 1984 going forward, more discrete production quality moving image digital-disk recording products appeared. Products from companies such as Quantel and Abekas also brought out complimentary compositing systems. For example, Abekas produced a stand -- alone digital -- disk recorder, the A60, which recorded 25 seconds of NTSC video onto two Y/UV disk drives, and gave rise to the Abekas A62 (in composite format) and the Abekas A64 (in component digital) formats-pairs of A60 series drives linked with video mixing, layering, and graphics control processors. It was 1989 when Avid Technology introduced and shipped the original Avid/1 Media Composer, setting off the digital-desktop editing revolution that would change video and film production forever. The non -- linear editor used proprietary motion -- JPEG imagining on a Macintosh platform, and external SCSI drives for storage. Since the introduction of the early video-disk recording device, the television industry has functionally transformed the disk recorder from a sports replay device into a tool with extensions well beyond those first single-purpose applications. Even with the 1991 introduction of HDTV disk recording by Philips, with the HDDR-1000; it would take two or three more years before disk recording concepts would mature to the level that a professional video server could be developed and sold, e.g., one of the first Tektronix Profiles, introduced in 1995. Today, throughout major broadcast and content-delivery centers, spinning disks are becoming the mainstay for moving image asset storage and playback. What once took 50, 24 -- inch diameter disk drives to store just 5 MB of 7 -- bit data; we now see redundant mirrored multi -- terabyte disk arrays attached to protected DVD -- RAM storage in similar footprints consuming an area about the size of the average living room. We can only wonder where the next 50 years will take us. TiVo seems to think that because their technology is for the consumer rather than for professionals they can patent it even though at the time of the patent the implementation was identical to many devices already being sold to and used by broadcasters at the time.