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Comments Posted On :HDV Grows Up: Sony's HVR-S270 and HVR-Z7

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Posted By Kevin Shaw on 10/9/2008 10:13:45 AM
The HVX200 was indeed ahead of its time, but the technology required to make it work could have been used back then to make the simpler flash-based video cameras we're finally seeing today. P2 cards consist of four (not two) SD cards in a RAID array with each card required to have read/write speeds of 20 MB/sec, well in excess of the data rate used in HDV and AVCHD cameras. In fact the maximum data rate for the new HMC150 camera is a modest 24 Mbit/sec, or 3 MB/sec - easily within the performance range of flash cards shipping in 2004 or earlier. So it wasn't P2 technology which made flash-based video cameras feasible, it was simply having the vision to use flash-based recording for a professional video camera. Today's best individual flash cards have theoretical performance of 320 Mbps and real-world performance of ~160 Mbps, and capacities up to 100 GB were recently announced. (See www.dpreview.com/news/0809/08092306pretec_64gb_100gb_cf.asp) Fast 16GB CF cards are selling for under $100 with slightly slower 32GB models for about the same price, compared to almost $900 for a 16 GB P2 card. The era of flash-based video cameras is here, with a few workflow wrinkles remaining to be worked out.


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