I'm using 25 GB BD-R to back up files so I want to get some media that I can have some confidence in (and yet is not too expensive). I am burning at 8x with the Pioneer BDR-205 (fw:1.03) and checking the quality (error scan) with Samsung SH-B083L (fw: SB00) using the Opti Drive Control 1.48 software to do LDC and BIS error scans.
So far I am satisfied with Verbatim 4x Inkjet-printable (media ID: VERBATIMc ), which the BDR-205 can burn at 8x with good results. I tried scanning one disc, holding 22.74 GB at 1x (90 minutes) and at 8x (17 minutes).
1x scan (22.74 GB):
LDC: 6.80 / 267 (avg / max)
BIS: 0.11 / 5
8x scan (22.74 GB):
LDC: 11.70 / 185
BIS: 0.21 / 8
According to c't magazine http://www.heise.de/ct/
for a quality BD-R burn, the average LDC should stay below 13 and the maximum BIS should not exceed 8, so these results qualify as good. I also tried "VINPOWER DIGITAL" media (media ID: PHILIPR04 ) which still reads back without failures, but did not do nearly so well in the error scan, even when burned at 2x which is pretty slow. A huge error rate after the 17 GB mark resulted in:
LDC: 1105.66 / 9728
BIS: 85.41 / 768