Question about HP Compaq nx8220 Notebook

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DVD Drive reads CD's but wont read any DVD's

The HP COMPAQ NX8220 DVDRW+/- Drive reads CD's but wont read a DVD I've downloaded and installed the new firmware bust still no luck. Running under Windows XP Picks up as DVD-RAM-Drive

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Hello,

Let me explain some things for you to understand what happened with the dvd drive.

A laptop (or desktop) dvd writter drive is actually build around 2 separate optical systems each specialised to deal with either a cd or a dvd type of disk.
A cd has normally around 650mb - 700mb.
A dvd has normally around 4,3gb - 4,7 gb.

But both disks have the sime size. So the larger capacity disk, the dvd has higher data density as related to the disk surface. Therefore because these disks are being read using laser diodes, each diode must be tuned to a specific frequency for each type of disk. A cd is read/written by a 860 nm diode (infrared) and a dvd is read written by a 630 nm diode (red). These are separate optic subcomponents (by the way, a blue ray disk and reader is called blue ray because of the diode that is used to read them, it's on 437nm and it's emitting blue light).
If your drive will read only cd's and fail to read a dvd then it means that the coresponding optic block for dvd reading has failed. The cd optic system will continue to function as it's not linked to the dvd part.
In this situations there is little to do to save your drive so you should consider the replacement or assistance in a service center for your problem. I'm sorry as we aren't able to fix this without having to dissasemble things and use some service equipment.

Posted on May 22, 2009

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  • 57 Answers

If u have tried original good DVD's it should work...or else u may be looking at replacement...

Posted on May 22, 2009

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