Also, for what it's worth, the recording mediums, Oxide and Evaporated Metal , for DV CAM and DVC Pro are incompatable- Using both types of tape in the same transport, even if the transport is electronically compatable , will cause head clogs and cross contamination of the tapes used within that transport. The 2 media combine to form a sticky compound. Nothing to do with SSS. I attended a DV Cam maintainance school and was informed of this situation . The chickens came home to roost when the department who purchased the DVC cameras and editing systems ignored this info , and allowed the users to use whichever type of tape that they wished. Troubles galore until we could get them to see the light. Another example of manufacturers' attempting to satisfy everyones appetite for technological advancement, while at the same time reaking havoc. I Digress... Bob Hodge Sr. Engineer Belfer Audio Archive >>> [log in to unmask] 6/10/2005 9:46:40 AM >>> Is there any information around about what is being done for long-term preservation of digital video? Uncompressed video files are very large, 27mb for every second of video at 30 fps. A full length movie can easily fill a small hard-drive. Anonymous SET ARSCLIST DIGEST <[log in to unmask]> wrote: I appreciate the numerous references to migrating data tapes every 5 years or so. However, that should not be misinterpreted to mean simple physical migration but should include a change of file format if warranted. As for the physical make-up of data tape I'm not sure. I do know that DV-CAM, R-DAT and other like miniature digital tape types are manufactured using evaporated metal. This method yields the most unstable tapes and should be used only for production and storage in the 3 - 5 year time frame only. I personally have seen tapes of both formats generate huge error counts after only a couple years. Kevin Irelan RA Friedman, Archivist Freedman Jewish Music Archive University Of Pennsylvania Webmaster, Yiddish-American Digital Archive (Not affiliated with University of Pennsylvania) http://yiddishsong.org Restored 78s in Real Audio --------------------------------- Discover Yahoo! Find restaurants, movies, travel & more fun for the weekend. Check it out!