| Differences Between CD DVD Media |
|
Even though both CD and DVD disks have the same As you may know, digital information is represented in ones and zeroes. Inside of these discs, very tiny reflective bumps known as lands and non reflective holes known as pits, which can be found beside the grooves, reflect both the ones and the zeroes of digital information. By reducing the wave length of the laser to 625mm or more infrared light, DVD technology has managed to write in smaller pits when compared to the standard technology of CD. This will allow for a greater amount of data per track on the DVD. The minimum length allowed for a pit in a single layer DVD-R is .4 micron, which is obviously more than the .0834 micron that a CD offers. The tracks of a DVD are narrower as well, which allows for more tracks per disc, which also translates into more capacity than a CD. The avaerage single layer DVD holds 4.5 GB of data, while a CD holds a mere 700 MB. Layers As stated above, a DVD has smaller pits and the lasers need to focus on them. This is actually achieved by using a thinner plastic substrate than in a CD, which means that the laser needs to pass through a thinner layer, with less depth to reach the pits. It's this reduction in thickness that's responsible for the discs that were only 0.6mm thickness - which is half that of a CD. Data access speed DVDs will access data at a much faster rate than a CD can. The average 32X CD-ROM drive reads data at 4MB a second, while a 1X DVD drive reads at 1.38MB a second. This is even faster than an 8X CD drive. Universal data format The recording formats of CDs and DVDs are quite different, as DVDs use UDF, or the Universal Data Format. This format allows data, video, audio, or even a combination of all three to be stored in a single file structure. The advantage to this is any file can be accessed by any drive, computer, or even consumer video. CDs on the other hand aren't compatible with this format. This will change the face of most Churches today. Moving toward Mp3 access for Christian media may be something unconsidered by many, but anyone who has become aware of services, like Tivo or DVR receivers can see where this is going. A step up from the VCR, these services allow you to access your TV programs on demand. A prime example is my wife, who when I suggested we get ours, thought I was hoping to just get another toy so I could watch more TV. Now, she especially finds it to be the best time-saver and argument stopper between the kids. It can be set to automatically record every episode of your favorite shows and watch them when you want. Most Churches are still doing thing status quo. They want you to attend church and hear the messages there. This, of course, is optimal for fellowship and the group dynamics for touching and agreeing with others. And when the message really touches, there are usually CD's you can buy on the spot. However, the quality of these messages on CD's may not stand the test of time. Not to mention audio cassette tapes, which are even more fragile. This is the only media that most churches have to offer. To get the word of God out and win souls for the Lord, the churches today will need to wake up quickly. Consider the cell phones with Mp3s. Not to mention, most 2008 cars will be manufactured with just Mp3s built in and downloads obtainable while driving down the road. For some in the church, the Mp3s are a dream come true, for others the worst nightmare. The challenge for most is to how to forge ahead in this technological revolution when technology is not the focus of your life. Churches and pastors have a powerful message. Thankfully, there are companies that can help move our churches safely through this technological transition so our younger generation is not missed. Ironically these services are being offered at a very reasonable price to get you moving in the right direction.
|
Home Articles |