today I bought a CnMemory-USB-drive containing a Samsung SN-S083B with the firmware version SB01. On my first burn attempt on a RICOHJPN-D01-67-double-layer-media (DVD+R) with 4x-speed, the burning started and continued for a while at 3x-speed, then finally changed to 4x-speed. Although the disc is ok (verifies ok on the burner and some other drives), it shows one visible circle on the side the burning takes place.
Is this circle something to be concerned about, esp. with this drive? I have already read here that these circles can be caused by the change in burning-speed during the burning-process, but I have never seen this with my other burners (LG, BENQ, PLEXTOR).
Thank you very much in advance and keep on rocking,
P.S.: I used IMGBURN 126.96.36.199 to burn a double-layer-image to perform this test.