Disc Grading System - BLER - Club CDFreaks

*BoSkin* · 17-06-2003

BLER

BLER - BLock Error Rate. A measure of the integrity of the data refrieved from a compact disc.
The block error rate can be measured over a given period of time.
It is usually reported in two or three ways by analyzers, i.e. :
Average BLER over entire part of the disc that has been read, peak BLER, etc.
Average of 220 is considered a marketable disc according to Red Book and Yellow Book standards.
Most manufacturers set higher standards for themselves, striving for an average BLER of under 50.

BLER

--

Disc Grading System

There are five different grades covering a wide range of performance: A, B, C, D, and F.

This feature provides a means of instantly evaluating a disc without looking at the individual data.
Here are the criteria used to determine the GRADE.
These criteria are somewhat arbitrary, but reflect generally accepted practice in the industry.

GRADE A = AVE BLER over the whole disc less than 6
NO E22 ERRORS
NO E32 ERRORS

GRADE B = AVE BLER over the whole disc less than 51
NO E22 ERRORS
NO E32 ERRORS

GRADE C = AVE BLER over the whole disc less than 101
NO E32 ERRORS
LESS THAN 1000 DROPOUTS

GRADE D = AVE BLER in all ten second periods is less than 220

GRADE F = AVE BLER in any ten second period is greater than 220 or Track Loss
occurred.

Generally, a GRADE A disc represents the best possible quality of disc.
GRADE B is still an excellent disc, but not quite perfect.
GRADES A & B are good discs for any use, including the most stringent CD-ROM uses.
Most CD-ROM publishers do not like to see BLER more than 50 or any E22 or E32
errors. Therefore, GRADES C through F would be unacceptable for these users.
However, GRADES C through D are still usable discs.

Source > Clover QA-201 or QA-201 Instruction Manual

semp · 04-10-2007

How is BLER relative to PI Errors and PI Failures on a scanned disk? Is it a combination of these resulting numbers?

Good post, any chance you can fix the images?

**DrageMester** · 04-10-2007

This thread is about grading CD media (not DVD media) and BLER is a term for error rate on CD media. BLER is the equivalent of PIE on a DVD.

This thread is old so don't expect the original poster to fix anything.

17-06-2003	#1 (permalink)
BoSkin CDFreaks Resident Join Date: May 2002 Location: Sthlm Posts: 5,497	Disc Grading System - BLER <a href='http://adstats.cdfreaks.com/www/delivery/ck.php?n=a13febf7&cb=INSERT_RANDOM_NUMBER_HERE' target='_blank'><img src='http://adstats.cdfreaks.com/www/delivery/avw.php?zoneid=30&cb=INSERT_RANDOM_NUMBER_HERE&n=a13febf7' border='0' alt='' /></a> BLER BLER - BLock Error Rate. A measure of the integrity of the data refrieved from a compact disc. The block error rate can be measured over a given period of time. It is usually reported in two or three ways by analyzers, i.e. : Average BLER over entire part of the disc that has been read, peak BLER, etc. Average of 220 is considered a marketable disc according to Red Book and Yellow Book standards. Most manufacturers set higher standards for themselves, striving for an average BLER of under 50. BLER -- Disc Grading System There are five different grades covering a wide range of performance: A, B, C, D, and F. This feature provides a means of instantly evaluating a disc without looking at the individual data. Here are the criteria used to determine the GRADE. These criteria are somewhat arbitrary, but reflect generally accepted practice in the industry. GRADE A = AVE BLER over the whole disc less than 6 NO E22 ERRORS NO E32 ERRORS GRADE B = AVE BLER over the whole disc less than 51 NO E22 ERRORS NO E32 ERRORS GRADE C = AVE BLER over the whole disc less than 101 NO E32 ERRORS LESS THAN 1000 DROPOUTS GRADE D = AVE BLER in all ten second periods is less than 220 GRADE F = AVE BLER in any ten second period is greater than 220 or Track Loss occurred. Generally, a GRADE A disc represents the best possible quality of disc. GRADE B is still an excellent disc, but not quite perfect. GRADES A & B are good discs for any use, including the most stringent CD-ROM uses. Most CD-ROM publishers do not like to see BLER more than 50 or any E22 or E32 errors. Therefore, GRADES C through F would be unacceptable for these users. However, GRADES C through D are still usable discs. Source > Clover QA-201 or QA-201 Instruction Manual __________________ CloneCD - Down & Dirty... Disc Identification Code Disc Grading System OPC & Beta + & - Defeating Cactus w Feurio!® CDR components & Dye characteristics List of CD/DVD media sites in N. America & U.K.

04-10-2007	#2 (permalink)
semp CD Freaks Member Join Date: Sep 2007 Posts: 109	Re: Disc Grading System - BLER How is BLER relative to PI Errors and PI Failures on a scanned disk? Is it a combination of these resulting numbers? Good post, any chance you can fix the images?

04-10-2007	#3 (permalink)
DrageMester Moderator Join Date: Oct 2004 Location: Back on the Internetz Posts: 13,598	Re: Disc Grading System - BLER This thread is about grading CD media (not DVD media) and BLER is a term for error rate on CD media. BLER is the equivalent of PIE on a DVD. This thread is old so don't expect the original poster to fix anything. __________________ Do not meddle in the affairs of dragons, for you are crunchy and taste good with ketchup.

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