I tested the blanks with Nero DiscSpeed:
General Information
Drive: BENQ DVD DD DW1640
Firmware: BSRB
Disc: DVD-R (INFOMEDIAR30)
Selected speed: 8 X
PI Errors
Maximum: 67
Average: 6.80
Total: 114200
PI failures
Maximum: 6
Average: 0.00
Total: 483
PO failures: 0
Jitter
Maximum: 11.0%
Average: 8.97%
Scanning Statistics
Elapsed time: 9:21
Number of Samples: 16792
Average scanning interval: 8.00 ECC
Glitches removed: 0
Overall, a good result. The Pi Errors may have max 280 and here there are 67 important the average (average) is just 6.8. Pi Failures may max 4 have here are 6 But as the BenQ burner a scanning interval have 8 burners is the maximum value for Benq at 32 (4 * 8). It would therefore max. 0.75 Pi Failures, above average need not to talk (0).
I still have to say that the torch is 6 years old and has been in regular use / will, accordingly, there are no top values as you would expect with a new burner but the figures speak for themselves. If the other blanks are similarly well in the spindle I can recommend this blanks for data storage as well as for videos.
Update 28.12.11
Burned almost all DVDs and all are within the scope.
5/5 stars
1:04:12
Ordered at Damro Technology.
3 DVD blanks of the new 50 spindle burned (Media Code RITEKF1) all failed! PI Errors beyond 280
Optical possible to distinguish the packaging, provided that they are not equal. In the good blanks (Media Code INFOMEDIAR30) to read up lock and open and above the bar code is the DVD icon. The bad blanks is above the barcode, strangely white, compact disc recordale multispeed reading although there are no blank CDs.
