[Blank]x Speed? - Blu-ray Forum

BluRayExplosion · 03-01-2008, 07:28 PM

I've been looking around for information on this for a while, what exactly is the multiplier that is used to enumerate the disc read speed? Is it based on how fast all the data on a single layer can be read in 'x' ammount of time? A 2x Blu-Ray is much faster than a 2x DVD correct?

dadkins · 03-01-2008, 07:35 PM

https://www.blu-ray.com/faq/#bluray_vs_dvd_comparison

1x =...

BD - 36.0mbps
DVD 11.08mbps

BluRayExplosion · 03-01-2008, 07:37 PM

Ah ok... so is it just an arbitrary value set in the Blu-Ray specification?

dadkins · 03-01-2008, 07:44 PM

No. Not arbitrary - actual!
A BD @ 1x is actually reading 3 times the bits per second than a DVD @ 1x.
Since BD-ROM is speced out at 1.5x it is reading at 5 times the rate as a DVD @ 1x.

BluRayExplosion · 03-01-2008, 07:50 PM

Well what I meant for arbitrary was they just picked a number to be the "standard" read speed, and all drives must be rated to read at a certain multiplier of this? It's all about what speed the disc is spinning, correct?

dadkins · 03-01-2008, 08:00 PM

Well, yeah.
Don't have the RPMs of the discs... but since Blu-ray has a tighter beam and writes/reads smaller pits on the disc... more pits(bits)can be written/read at the same given time frame/speed.

This is why we have the same disc size and 25-50GB.
My drive on this laptop doesn't scream with Blu-ray Discs... but a CD (24x) or DVD(8x)... it does start humming.

1x BD vs 1x DVD... BD wins!
1x BD vs 8x DVD... DVD wins!

Hope this helps!

03-01-2008, 07:28 PM	#1
BluRayExplosion Active Member Member since:Dec 2007 Blu-ray collection:27	[Blank]x Speed? I've been looking around for information on this for a while, what exactly is the multiplier that is used to enumerate the disc read speed? Is it based on how fast all the data on a single layer can be read in 'x' ammount of time? A 2x Blu-Ray is much faster than a 2x DVD correct?

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03-01-2008, 07:35 PM	#2
dadkins Blu-ray Samurai Member since:Jan 2007 Location:Hercules, CA Blu-ray collection:35 Blu-ray reviews:2	https://www.blu-ray.com/faq/#bluray_vs_dvd_comparison 1x =... BD - 36.0mbps DVD 11.08mbps

03-01-2008, 07:37 PM	#3
BluRayExplosion Active Member Member since:Dec 2007 Blu-ray collection:27	Ah ok... so is it just an arbitrary value set in the Blu-Ray specification?

03-01-2008, 07:44 PM	#4
dadkins Blu-ray Samurai Member since:Jan 2007 Location:Hercules, CA Blu-ray collection:35 Blu-ray reviews:2	No. Not arbitrary - actual! A BD @ 1x is actually reading 3 times the bits per second than a DVD @ 1x. Since BD-ROM is speced out at 1.5x it is reading at 5 times the rate as a DVD @ 1x.

03-01-2008, 07:50 PM	#5
BluRayExplosion Active Member Member since:Dec 2007 Blu-ray collection:27	Well what I meant for arbitrary was they just picked a number to be the "standard" read speed, and all drives must be rated to read at a certain multiplier of this? It's all about what speed the disc is spinning, correct?

03-01-2008, 08:00 PM	#6
dadkins Blu-ray Samurai Member since:Jan 2007 Location:Hercules, CA Blu-ray collection:35 Blu-ray reviews:2	Well, yeah. Don't have the RPMs of the discs... but since Blu-ray has a tighter beam and writes/reads smaller pits on the disc... more pits(bits)can be written/read at the same given time frame/speed. This is why we have the same disc size and 25-50GB. My drive on this laptop doesn't scream with Blu-ray Discs... but a CD (24x) or DVD(8x)... it does start humming. 1x BD vs 1x DVD... BD wins! 1x BD vs 8x DVD... DVD wins! Hope this helps!

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