February 3, 2009
Can you please explain the difference between CDs and DVDs?
Q:
Can you please explain the difference between CDs and DVDs? And how about their ROM drives? Are they really all that different?
A:
I sure can and yes, they are! There seems to be a lot of confusion when it comes to those two types of media. These days, most computers come with both a CD ROM drive and a DVD ROM drive and because of that, I think a lot of people assume you can use either drive for either type of disk. Well, that's just not the case. Yes, the drives are the same size and shape, but that's where their similarities end. Let's check out some of the differences and get all of this cleared up, shall we? Here we go!
For starters (and this is the biggest difference), DVDs have seven times the capacity that CDs do. If you're not sure, that's quite a bit! Now, I know you're probably thinking, "How can that be possible?" Well, DVDs use more layers than CDs and the way DVDs are written is quite different as well, which is a huge booster for the DVD's capacity size.
Now, it's time for a little background information. CDs and DVDs both store their data in little grooves that run all around the disk. Our CD and DVD ROM drives then scan those grooves with a laser beam, which is how we're able to listen to music or watch a movie on our computers. They both also work with lands (reflective bumps) and pits (non-reflective holes), which help to represent the digital information the CDs and DVDs need in order to work.
With that said, DVDs work with much smaller pits than CDs. Basically, the smaller the pits, the more data you can fit onto the disk and that's how DVDs overcome CDs in terms of available space. As a matter of fact, the normal pit length for a discount cialis DVD layer is 0.4 and for a CD, it's 0.834. Also, the tracks along a DVD are a lot closer together than on a CD, so that allows for more tracks per disk. As you can see, all of that information runs together to give a DVD a lot more room than is allotted on a CD.
That's also where the biggest difference between the CD and DVD ROM drives comes into play. Because DVDs work with such smaller pits, etc., they need a special drive that will be able to read them. Therefore, a DVD ROM drive cannot read a CD and vice versa (a CD ROM drive cannot read a DVD). That's why most computers these days are coming with both drives already installed. So, while it may seem a little wasteful, now you know why it's necessary!
Want to know some more differences? Well, like I said earlier, the layer sizes for CDs and DVDs are quite different as well. Along with DVDs having several more layers than CDs, they're also much thinner. That helps when the laser beam inside the drive is reading the DVD. DVDs also come with double sided layers, which obviously, allow for more information all the way around.
Another big difference is that DVDs can access data a lot faster than CDs can. They also have a better error correction method. And one last difference is the recording format the two types of media use. DVDs record using the Universal Data Format (UDF) method and CDs are not compatible with that type at all. The UDF format allows DVDs to store data, video, audio or a mix of all three onto a single file structure. That file can then be accessed by any drive or computer. CDs just can't say the same.
Now, I know it may sound like DVDs are the best option when it comes to certain things, but don't forget that there are times when a CD is just what you need. Sometimes DVDs are just too much and a simple CD will do. Either way, the two media formats are very convenient and handy for all of our recording needs. You have to give props to both of them for all they do!
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ultra-value group, however in this Tech Tip; we will be concentrating on the two mainstream end-user groups of processors) It should be noted that there is a lot of cross-over within the groups in the processors core architecture as well as naming conventions.
In the Value group of processors, we find that both Intel and AMD have very similar offerings. These are usually single core, low cache, low bus speed, low performance processors that appeal to the wise spender that is (hopefully) in all of us. These processors get the job done for most basic computer uses (such as e-mail, surfing the web and word processing) and are ideal for when a lot is not asked of the computer. Their major advantage? In a word: PRICE! If you plan to use the computer for these (and similar) basic computing tasks, and want to keep an eye on the pocketbook, then these may well be the perfect processors for you. But, be forewarned, sometimes the slowness of these processors can be maddening (especially with 
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In the Mainstream group of processors, we also find some very fine processors that give you added power, but are still friendly to the pocketbook. Though still not ideal for many high-end gaming applications, they will give you added power when you need it and can handle multiple applications with ease. In this group, Intel makes the 
area, Intel almost always out performs AMD. The good news is that you will find the very good Turion and Phenom processors at a better price than Intel’s Core 2 or Core i7 processors. These processors come with two, three or four cores. Intel calls these either Duo (for two cores) or Quad (for four cores). As a side note: with Intel’s Core 2 processor, the two does NOT stand for the number of cores, but for this being the second generation Core processor, thus a two core processor will be called the Core 2 Duo while the four core processor will be called the Core 2 Quad. AMD makes things a little easier, simply having X2 (for dual core), X3 (for triple core) and X4 (for four cores) listed after the processors name. Up until the release of the Core i7, the Core 2 processor was one of the best all around consumer processors to get. The 
In Conclusion
