What is the difference between dvd rw and dvd rw discs

It is tested and approved by the DVD Forum founded through merging of various international firms. It was founded in The disc is primarily used to store important data. The only flaw with an otherwise efficient device is that it can be written only once.

The data is incorporated with the use of laser on it. The disc is known to store up to 4. Also know that both the discs were released in As you can already understand by its name, it is a circular disc which is mm in diameter and has a thickness of 1. The only remarkable difference separating the discs is that DVD-RW can be erased and written again and again, as many times you wish.

Internal, or iDE, uses a faster bus, so it should be faster and more reliable. Really the only reason to use external would be portability between computers. For just one computer, I would go internal. Now that the dual-layer models are out, the single layer dual-format drives are getting quite reasonable, even at the faster speeds.

However, not all brands are the same for reliability and compatibility. Best of luck. Message Edited by osprey4 on PM. Browse Community. Turn on suggestions. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. If you also want to know their differences and would like to know which DVD disc to choose, this guide would be helpful.

We will show you the detailed differences between these 4 DVD disc types. Data can be burned on the DVD only once. On the other hand, data on an RW disc can be erased and rewritten several times. Only once i. The DVD R disc use a single write laser to change a dye layer affecting the opacity of the dye. The laser darkens spots on the recording layer dye layer to record information. On the contrast, DVD RW discs use a phase change recording layer where the write laser changes the polarization of the recording layer usually a metallic material by crystallizing it.

In order to erase this layer on DVD RW discs so new data can be added, an erase laser usually the recording laser refocused to be wider than that needed to record data is used. This erasing function heats the layer causing it to become amorphous again as it was in the blank state. Both types of discs can be written to only once but read many times. The difference lies in their formatting and how they read data on the disc. For DVD-R, the laser position is decided by the tiny marks along the grooves in the discs.

Currently, almost all players support the two formats.