Download the Tom's Hardware App from the App Store
The reference for current tech news
Yes No
Tom's Hardware > Forum > Storage > CD/DVD Drives > [Solved] Do Blu-Ray / DVD readers have two heads?

[Solved] Do Blu-Ray / DVD readers have two heads?

Forum Storage : CD/DVD Drives [Solved] Do Blu-Ray / DVD readers have two heads?

Related Content
You have searched for " [Solved] Do Blu-Ray / DVD readers have two heads?" . You might be interested in the following threads:

See more for " [Solved] Do Blu-Ray / DVD readers have two heads?"

Can't find your answer?
Ask!

Best answer from Area51reopened.

General Discussion

|

Hard Drives

|

CD/DVD Drives

|

CD/DVD Writers

|

Optical Media

|

Flash Media

|

NAS/RAID

|

SSD

|

Buffalo Tech

|

QNAP

|

RunCore

Word :    Username :           
 
WyomingKnott   01-04-2012 at 06:26:34 PM

Does a device that can play both Blu-Ray and DVD video need two different lasers? Are they combined into one head, in two separate heads on the same mechanism, or completely independent?

Thanks.

Reply to WyomingKnott
Register or log in to remove.
COLGeek   01-04-2012 at 07:39:26 PM

2 lasers (different wavelengths), usually on one "head" to minimize the number of moving parts and costs, while increasing reliability.

Reply to COLGeek
Area51reopened   01-04-2012 at 07:59:26 PM
Best answer

http://i1123.photobucket.com/albums/l546/area51reopened/220px-BluRayLaser.jpg

2 lasers in the blueray ^ optical drive

While a DVD uses a 650 nm red laser, Blu-ray Disc uses a 405 nm "blue" laser diode. Note that even though the laser is called "blue", its color is actually in the violet range.


Message edited by Area51reopened on 01-04-2012 at 08:05:00 PM
Reply to Area51reopened
WyomingKnott   01-05-2012 at 02:40:39 PM

Tough choice for best. First right answer or picture? Too bad I can't split it.

COLGeek: I had already read that on Wikipedia, but gave up after reading "Backward compatibility

Though not compulsory, the Blu-ray Disc Association recommends that Blu-ray Disc drives be capable of reading standard DVDs and CDs, for backward compatibility. A few early Blu-ray Disc players released in 2006 could play DVDs but not CDs."

One of my favorite half-witticisms is "Great minds think alike. So do you and I."

Reply to WyomingKnott
Area51reopened   01-06-2012 at 02:18:25 AM

This topic has been closed by Area51reopened

------------------------------ http://i1123.photobucket.com/albums/l546/area51reopened/Moderator1-1.jpg
http://valid.canardpc.com/cache/banner/2383852.png
 Reply to Area51reopened
Register or log in to remove.
See all topics related to "Do Blu-Ray / DVD readers have two heads?"
Tom's Hardware > Forum > Storage > CD/DVD Drives > [Solved] Do Blu-Ray / DVD readers have two heads?
Go to:

There are 779 identified and unidentified users. To see the list of identified users, Click here.

Bestofmedia Forum ©
2000-2009 Bestofmedia Group
Page generated in 1.113 seconds
  • Ask the community now
  • Publish
Ad
Latest best answer
Audio through DVI
By amite, 61 days ago:

Recently, I replaced my older Asus GT9600 card with the newer Asus GTX560. Now, at first...

They won a badge
Join us in greeting them
How do I win badges?
Top experts
Become an expert The rank
Partners