Damaging DVD+R disks

[ProjMan]

How vulnerable are DVD+R disks to higher powered handheld lasers? DVD+R disks are recorded using a 650nm diode laser, so enough mw of 650 will be able to mess up the recording dye enough to make a burned DVD+R unreadable. The only questions are how many mw, at what range, and for how long, it will take to wipe the dye.

Anybody tried this?

 

[Tabish]

Yea. If you want to use the disk, don't focus the laser on it lol

 

[Tech_Junkie]

How vulnerable are DVD+R disks to higher powered handheld lasers? DVD+R disks are recorded using a 650nm diode laser, so enough mw of 650 will be able to mess up the recording dye enough to make a burned DVD+R unreadable. The only questions are how many mw, at what range, and for how long, it will take to wipe the dye.

Anybody tried this?

I would imagine if you checks the specs on your DVD burner it will answer all your questions.

 

[bobhaha]

Yea. If you want to use the disk, don't focus the laser on it lol

*sigh* thanks for that... Tabish

well the red diodes we use in our lasers are overdriven versions of what are in the DVD drives.. so im guessing that if a 8x dvd can only be used with a 8x DVD drive.. well the 8x red diode or higher will be able to do what you require.. you just need it focused!

 

[Tabish]

*sigh* thanks for that...

well the red diodes we use in our lasers are overdriven versions of what are in the DVD drives.. so im guessing that if a 8x dvd can only be used with a 8x DVD drive.. well the 8x red diode or higher will be able to do what you require.. you just need it focused!

Don't forget, the diodes are designed to be pulsed. We use CW. (much more energy)

 

[Things]

Don't forget, the diodes are designed to be pulsed. We use CW. (much more energy)

Not really, they are also designed for CW, it's just that everyone here runs them much past their CW ratings ...

 

[bobhaha]

Don't forget, the diodes are designed to be pulsed. We use CW. (much more energy)

lol the diodes in the dvd drives are not pulsed.. they burn marks into the surface of a dvd.. in a way they are "plusing" but they are not "pulse" diodes. The diodes turn off and on fast but they are still CW diodes not pulsed.

 

[Tabish]

Ahh, ok.
Also, the disk is spinning rapidly when the drive is burning. If you focus a laser on the disk, it wont be spinning so much more energy will hit a small spot.

 

[nikokapo]

Ahh, ok.
Also, the disk is spinning rapidly when the drive is burning. If you focus a laser on the disk, it wont be spinning so much more energy will hit a small spot.

If you maintain the laser in the same position for long enough you'll be able to carve an ellipse on the spinning disk.

Laser diodes used in drives are operated in CW, if they were pulsed then they could miss a whole cluster or sector if it's not pulsed quickly enough.