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In the Name of God بسم الله

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There are two types of CD-ROM drives we can mod:

1- 24x to 40x

2- 40x or higher

Drives slower than 24x are too old to be modded.

24x to 40x CD ROMs

Laser Head Adjustments:

The track pitch of CDs is 1.6 microns, and the track

pitch of DVDs is only 0.8 microns. The minimum length

of track pits of CDs is 0.843mm, and the minimum

length of track pits of DVDs is 0.293mm. That's why

DVD discs can store much more data in the size of a


Pinpointing this situation, we need to adjust the

laser head so it can read discs with smaller track

pitchs and shorter track pits. Open up the CD-ROM

drive, do you see a lens on the rail? That's the laser

head. On the side of the laser head, there's a screw

you can adjust.

This is the key of this mod.

This screw can adjust the size of the laser beam that

lands on the disc. Referring to the above, after

adjusting, the laser beam should be less than 0.293mm,

to suit the needs of DVD discs. So turn that screw 2-3

times. I got this number through trial and error. Mark

with a pencil, in case you forget how many times you

turned that screw.

Speed adjustments:

DVD-ROM drives can play DVD movies smoothly at 4x

speed. If we're modding a 32x CD-ROM drive, the

rotation speed is obviously too high, increasing heat,

and shortening the life of the drive.

So we need to decrease the speed of it.

Most people know that power supplies can provide 5V

(red wire) and 12V (yellow wire) electricity output

for Molex connectors. Find the Molex connector you'll

plug into the modded CD-ROM drive, cut the yellow wire

or insulate it with tape, so only 5V of electricity is

transferred to the CD-ROM drive. The speed of the

drive is now 32 * 5/17 = 9.41x and can now fulfill our


40x or higher CD ROMs

When 40x CD-ROM drives are released, most

manufacturers are already producing DVD-ROM drives. To

lower cost, they use the same core as DVD-ROM drives

with DVD functions disabled. What we need to do here

is to re-enable the DVD function.

Open up the CD-ROM, behind the circuit board, look for

a jumper that says DVD JUMP. Find a jumper to connect

this jumper. Thin metal wire also works fine.

OK, so the DVD function is unlocked, but we still need

to decrease the speed. Use the instructions above on

how to decrease the speed of the drive.


Modded drives cannot be detected in POST, that means

you cannot use it in DOS. But once you get into

Windows, the drive works fine.

Modded drives have no region code problems.

Modded drives MIGHT NOT read DVD9 discs, that's why I

said you can watch most retail DVDs in the beginning

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