Make your CD-ROM play DVDs as well

Be careful when using the technology in this article
Re-identification: if anyone has an extra cdrom, try again.

As a carrier of relatively late appearance, DVD disc has a huge capacity advantage over CD-ROM. Use it

Storage film, excellent image quality has been recognized by everyone, now the market price of DVD-ROM is getting lower and lower, the General

You can buy at or below 300. However, buying a DVD drive is only for viewing dishes, which is not a waste. Why don't we

The CD-ROM at hand to make good use of it?
After many experiments, I found that we can use the configuration of a few years ago to watch most of the DVD movies on the market, as long as you follow the author said, The CD-ROM to a certain degree of DIY, the operation is not complex.
We divide the CD-ROM to DIY into two types:
I. 24X or less 40X
Ii. 40X and higher speed
The CD-ROM below 24X has no possibility of restructuring because of its long history and backward technology.

(1) 24X or less 40X:
Laser head:
Because the rail distance of the CD-ROM disc is 1.6 microns, the rail distance of the surface DVD disc is only 0.8 microns, the maximum Short Message pit length of the CD-ROM disc is 0.843 microns, and the maximum Short Message pit length of the DVD disc is 0.293 microns. Therefore, the DVD can store a larger number of files in the same area. In this case, we need to adjust the laser head to adapt to a smaller rail distance and pit distance. Split the CD-ROM shell, will see on the rail, there is a lens, that is the laser head. On its side, there is a small screw that can be turned. It is the key to adjustment. This screw can adjust the size of the area on which the laser beam falls onto the disc.
Through the data at the beginning, we can know that the adjusted beam should be less than 0.293 microns to meet the needs of the DVD. The specific corresponding to the screw adjustment, generally 2-3 turns. This location requires you to experiment on your own.

Remind the reader to mark it with a pen before adjustment, so you don't know how much it turns.

Rotating part:
DVD-ROM above 4X, You can smoothly watch DVD movies. If it is 32X CD-ROM modified, the speed is significantly too high, also increased the calorific value, virtually increased the loss. In this regard, we must adopt a slowdown approach. As we all know, the computer can provide 5 V (red wire), 12 V (yellow wire) two types of output. We find out the four-pin power plug for CD-ROM, cut the yellow one or seal it with a tape, so that only 5 V voltage is sent to the CD-ROM, the speed of the CD-ROM is changed to 9.41, meet our needs.

(2) 40X and higher speed:
When the 40 x CD-ROM market, there has been a lot of DVD-ROM supply, manufacturers out of cost reduction, they are originally from the same production line products, only manufacturers manually shield the DVD function, and the manufacturing price is different. What we need to do is to find out the shielded DVD function.
Open the CD-ROM housing, behind the circuit board, to find a vacant jumper, or there is a component position is vacant, there is a DVD on the side of the JUMP words. Find a patch cap and connect it. Or use a small copper wire to connect the two ends. Enable the blocked DVD feature. Of course, the speed reduction is still required. This can be done as described in (1.
Note:
(1) modified "CD-DVD-ROM" will not be detected in the self plug-in, that is, you can not in DOS

. However, it can be used normally as long as you enter WINDOWS.
(2) modified "CD-DVD-ROM" does not exist area code problem.

(3) because of the problem of data storage format, the modified "CD-DVD-ROM" may not be able to read D9 dishes, this is also why I am talking about watching most of the DVD movies on the market.