Blu-ray seek speeds - Blu-ray Forum

Rike255 · 03-03-2008, 09:05 PM

I'm looking for some stats on seek speed for a Blu-ray disc. I know read/write speeds of a 2x drive is 72Mbps. OH I forgot to mention I'm referring to the PS3 blu-ray drive.

I'm interested more for the gaming side, I heard somewhere that a blu-ray's seek speed for 1/3 is double the time of DVD and three times longer for full.

Looked all over on google and stuff, couldn't find any reliable info.

Thanks in advance.

Rike255 · 03-04-2008, 04:07 AM

Nobody knows? Hmm I wonder how I'll get this info then.

Ian@CDRLabs · 03-05-2008, 03:34 AM

I'm not sure how the drive in the PS3 is, but from my experience, the seek times are typically higher with BD media. It varies from drive to drive and from one media type to another.

Rike255 · 03-05-2008, 04:29 AM

I think I've figured it out. I don't know hard numbers but I understand where it comes from.

Since a BD has a constant read speed (72Mbps), the disk has to spin faster to read the data closer to the inside of the disc. A DVD has a constant spin speed so data is read slower at the inside of the disc.
It's this change in speed that causes the slower seek times.

I don't have a source for this but I assume that's what it is.
So it is possible that it would take 3 times as long for a BD to seek if laid out the same way as a DVD.
But since a BD has a much larger capacity then a DVD, it would never have the data laid out the same way so this is an unfair comparison. The aperture won't have to move nearly as far on a BD as on a DVD.

WickyWoo · 03-05-2008, 07:12 AM

The stated data transfer rate of any optical drive is basically a best case scenario. You are indeed correct that the closer to the outside, the faster the read.

But the same factors are there for CD/DVD/BD when it comes to seek times

03-03-2008, 09:05 PM	#1
Rike255 Blu-ray Ninja Top contributor Member since:Jul 2007 Location:AB, Canada PSNetwork: Rike255 Home Theater Gallery:44 Blu-ray collection:57	Blu-ray seek speeds I'm looking for some stats on seek speed for a Blu-ray disc. I know read/write speeds of a 2x drive is 72Mbps. OH I forgot to mention I'm referring to the PS3 blu-ray drive. I'm interested more for the gaming side, I heard somewhere that a blu-ray's seek speed for 1/3 is double the time of DVD and three times longer for full. Looked all over on google and stuff, couldn't find any reliable info. Thanks in advance. Last edited by Rike255; 03-03-2008 at 09:14 PM. Reason: PS3 bd drive.

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03-04-2008, 04:07 AM	#2
Rike255 Blu-ray Ninja Top contributor Member since:Jul 2007 Location:AB, Canada PSNetwork: Rike255 Home Theater Gallery:44 Blu-ray collection:57	Nobody knows? Hmm I wonder how I'll get this info then.

03-05-2008, 03:34 AM	#3
Ian@CDRLabs Member Member since:May 2007 Location:Madison, WI	I'm not sure how the drive in the PS3 is, but from my experience, the seek times are typically higher with BD media. It varies from drive to drive and from one media type to another.

03-05-2008, 04:29 AM	#4
Rike255 Blu-ray Ninja Top contributor Member since:Jul 2007 Location:AB, Canada PSNetwork: Rike255 Home Theater Gallery:44 Blu-ray collection:57	I think I've figured it out. I don't know hard numbers but I understand where it comes from. Since a BD has a constant read speed (72Mbps), the disk has to spin faster to read the data closer to the inside of the disc. A DVD has a constant spin speed so data is read slower at the inside of the disc. It's this change in speed that causes the slower seek times. I don't have a source for this but I assume that's what it is. So it is possible that it would take 3 times as long for a BD to seek if laid out the same way as a DVD. But since a BD has a much larger capacity then a DVD, it would never have the data laid out the same way so this is an unfair comparison. The aperture won't have to move nearly as far on a BD as on a DVD.

03-05-2008, 07:12 AM	#5
WickyWoo Blu-ray Champion Member since:May 2007 Trading Score:2	The stated data transfer rate of any optical drive is basically a best case scenario. You are indeed correct that the closer to the outside, the faster the read. But the same factors are there for CD/DVD/BD when it comes to seek times

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