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  1. DVDs and CD ROM By: Deborah Childers LIB 5050 Catawba Cohort Spring 2004

  2. What is a CD ROM? Almost Everyone has a CD ROM on their computer. ROM stands for Read Only Memory. In other words, you can read data from the CD – you cannot write data Though now CDR or CD recordable equipment is avalailable and affordable.

  3. What is DVD? DVD-began as the Digital Video disc but now means Digital Versatile Disc or just DVD. It is a high capacity disc that looks much the same size and is often confused with the CD ROM. The DVD hardware equipment can be used to play all CD ROM discs.

  4. Overview and Features • DVD FEATURES: • Features a high capacity disc for video, multimedia, games as well as audio applications. • Very High Quality Video • All DVD hardware will play audio CD’s and CD ROMS • The DVD disc is capable of using both sides and multiple combinations of sides. • Recordable and rewritable versions are available. • CD ROM FEATURES: • The data in a CD ROM disc is divided into sectors. • The data is contained in files. A file system is used so files can be accessed easily and quickly. • Long shelf life (100 years compared to one year for tape) • Data cannot be erased or altered.

  5. Facilities Needed for Use: • DVD does not need a computer to control the DVD program (though a DVD disc can be played on a computer if the computer had a 166 MHz processor, DVD ROM drive some additional equipment such as a video decoder card or software added to the computer.) • Today’s players are lighter and less expensive than they were just a few years ago. DVD players are now so portable and small that they are commonly found in vehicles. Lessons can take place virtually anywhere via portable DVD players, appealing to mobile classrooms and on the go administration. • CD ROM discs are read by CD ROM drives which have been standard components on personal computers for years now.

  6. Advantages of CD ROM and DVD • DVD • The DVD laser beam has to only read half of the thickness of a disc compared to CD technology • DVD’s will have increased storage of 7 to 26 times the storage of a CD ROM • DVD’s have faster access speeds as compared to CD ROM. • DVD’s provide on-screen user interface that enables educators to randomly access video information in any order. • CD ROM • The capacity of the CD ROM is nearly 700 megabytes of data (nearly the equivalent of 500 high density floppy discs) • Data on a CDROM can be accessed much faster than a tape • Data can be read on any PC that has a CD reader installed • Rugged – reliable shelf life (100 years compared to one year for a tape)

  7. Disadvantages of CD ROM and DVD • CD ROM • Slower than hard discs • You cannot write to a pre-recorded CD ROM but only to recordable versions • Industry experts believe that CD ROM will only exist for another 3-5 years and then schools will move primarily to internet based delivery with server based processing and storage. • DVD • DVD looks to be the next big thing in removable storage but with 5 different DVD formats to choose from and another on the way…”it may still be in the nightmare stage of development.” This may sound like the old 8 track cartridge/cassette format dispute all over again for those of you old enough to remember that!

  8. The Future Most Media Coordinators are still comtemplating making the transition from VHS to DVD for many reasons. Just like CD’s have almost replaced albums and cassettes, DVD’s are replacing CD’s and video cassettes. VHS may be fadingas a home format but there are still 120 million VCR’s in our nation’s homes and uncountable numbers of VCR’s and VHS tapes in our schools. VHS tapes will probably be in out school libraries for another decade though statistics show that DVD is growing faster than any other consumer electronics format in the USA and Europe.

  9. Public Libraries have started ordering feature films on DVD’s but currently there is not much demand for DVD feature films from schools. There are very few educational titles available in the DVD format. The Library Video Company catalog has 14,000 educational videos but only 1,000 are available in DVD format. .

  10. To DVD or NOT DVD.... That is the Question?