Disc Grading System - BLER
| Blank Media Discuss, Disc Grading System - BLER at Consumables forum; 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 |
| 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 |
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| 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? |
| 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. 
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