Blu Ray Should develop Fast Laser Read Beams

[bluray]

Nice that Blu-Ray can hold 25GB of data on one side, however reading or copying this huge amount of data may take forever. When CD drives came out there was a technology to read cd's at 100x speed through 5 beam lasers. As many individuals know 52x or 56x cd drives never read at this speed. So that technology of 5 lasers to read data was great. DVD drives should've come out with that similar technology. Because when you store 4.7GB on DVD R or 8.5GB on DVD DL, write speed is fast (16x I think can be burned in 15 minutes) but the read speed is very slow. That is an annoying problem DVD devices have. Since Blu- Ray is new they should work with PC manufacturers to develop not only high write speeds but fast read speeds. Blu-Ray PC drives should consider using something like 20 beam blue laser readers or otherwise there will be angry consumers waiting forever to transfer 25GB or 50GB BD-ROM's data to hard drive or other destination.

[georgir]

uhm... how do you mean writing is fast and reading is slow? reading is always possible faster than writing. if writing a dvd in 15 minutes is ok for you, why is reading it in 15 mins too slow for you?

if you're getting slower reading speeds, you most probably have a misconfigured system. your HDD isn't using UDMA or somesuch...

also remember that the most common use of all these optical discs will be just for watching video. anything as slow as 4x speed is plenty for this purpose (i guess theoretically 1x should be enough) and the technology is expected to get up to 12x at the same disk rotation speed used in current DVDs.

also any tricks for speeding up reading, like using multiple lasers and such, arent a topic of the actual BluRay format specification - they're up to the drive manufacturer. if there is need for it, be sure it'll be implemented.

btw 20 beams sounds too excess, to the point of being ridiculous. the details of actually producing such a drive aside, 20 beams each reading at 12x will result in 240x read speed, i.e. more than 120MB/s! There's no HDD out there that can manage a sustained write speed like that

EDIT: ok my MB/s figure might be off... hmm, I'm too lazy to search for 100% true info, but it seems it might just as well be 240MB/s

Also if you think about it, a single laser can read mutliple layers at once, which will speed things up the same way as if there were several lasers (if data is properly interleaved between the layers). With the expected 8 layer disks I dont expect anyone could find the reading speed too slow

[Jerin]

You are correct that no Hard Disk can manage such great writing speed.

[th3archiv3]

Originally Posted by bluray

Nice that Blu-Ray can hold 25GB of data on one side, however reading or copying this huge amount of data may take forever. When CD drives came out there was a technology to read cd's at 100x speed through 5 beam lasers. As many individuals know 52x or 56x cd drives never read at this speed. So that technology of 5 lasers to read data was great. DVD drives should've come out with that similar technology. Because when you store 4.7GB on DVD R or 8.5GB on DVD DL, write speed is fast (16x I think can be burned in 15 minutes) but the read speed is very slow. That is an annoying problem DVD devices have. Since Blu- Ray is new they should work with PC manufacturers to develop not only high write speeds but fast read speeds. Blu-Ray PC drives should consider using something like 20 beam blue laser readers or otherwise there will be angry consumers waiting forever to transfer 25GB or 50GB BD-ROM's data to hard drive or other destination.

they are working with apple dell and hp if u didnt know.... also 20 beams will make it very expensive and those angry consumers will get even madder at that price.... and besides they already did make read write speeds faster read the blu-ray site more and besides this is better then dvd

removed rude comments - n2blu

[th3archiv3]

rude comments deleted - n2blu

[Jerin]

rude comments deleted - n2blu

[thunderhawk]

lets stop insulting people :x and lets get back to the subject ok?...

[zombie]

Originally Posted by thunderhawk

lets stop insulting people :x and lets get back to the subject ok?...

Agreed.

[thunderhawk]

To get back to the topic...

With a write speed of 36 Mbps (1x) and 72 Mbps (2x)...
It would take 11 111 seconds (yes, +11 000) or 186 minutes or 3 hours to write a 50 GB Blu-ray Disc at 1x...
At 2x, that would be 1 hour and 30 minutes.
At 4x, that would be 45 minutes.
At ....

I'd like to know what the fysical speed limit of the disc would be, expressed in #x...
Like for CDs its 52x, if they'd go faster, the disc would simply fall apart.
For DVDs its 16x, for the same reason. I hope they'll go at least at 8x for Blu-ray Disc...

[Gorkab]

Originally Posted by thunderhawk

To get back to the topic...

With a write speed of 36 Mbps (1x) and 72 Mbps (2x)...
It would take 11 111 seconds (yes, +11 000) or 186 minutes or 3 hours to write a 50 GB Blu-ray Disc at 1x...
At 2x, that would be 1 hour and 30 minutes.
At 4x, that would be 45 minutes.
At ....

I'd like to know what the fysical speed limit of the disc would be, expressed in #x...
Like for CDs its 52x, if they'd go faster, the disc would simply fall apart.
For DVDs its 16x, for the same reason. I hope they'll go at least at 8x for Blu-ray Disc...

Yep, 45 minutes in theory to burn 50 Go is really too hard to wait... Also, what will be the charge on the processor while burning ? :shock:

[thunderhawk]

Oh yes... However, I don't know if it'll require you to upgrade your computer dramatically (in 2006 or 2007 when you consider a BD drive).

If you see the transmission speeds in RAM architecture and other architectures, they're all in tens of Gbps now, with PCI Express and other devices, DDR2 RAM, etc

However, I don't know the exact numbers or the transmission speeds from the RAM to the drive... Or the CPU usage when burning a disc (if it DVD or CD or BD)... Are there any fact sheets for that, or any sheets where you can apply math on it so you can approach....?

[Gorkab]

Originally Posted by thunderhawk

Oh yes... However, I don't know if it'll require you to upgrade your computer dramatically (in 2006 or 2007 when you consider a BD drive).

If you see the transmission speeds in RAM architecture and other architectures, they're all in tens of Gbps now, with PCI Express and other devices, DDR2 RAM, etc

However, I don't know the exact numbers or the transmission speeds from the RAM to the drive... Or the CPU usage when burning a disc (if it DVD or CD or BD)... Are there any fact sheets for that, or any sheets where you can apply math on it so you can approach....?

Some burners takes 25 %, some others 15 % some almost nothing :|

[thunderhawk]

I think it all depends on your system configuration and what / how you burn...

But I believe you can create a "System Requirements" for a BD drive to burn a BD at lets say 2x