Created attachment 107725 [details] k3b.txt Hello, I'm doing some tests and it does not record to 6x. Regards, -- Cristian
*** This bug has been marked as a duplicate of bug 380067 ***
Hi, the low effective speed is not a bug but a feature of formatted BD-R media. During writeing the freshly written blocks are read and compared with the data which are still in the drive buffer. This frequent change between writing and reading slows down overall speed. Especially if reading is not very successful. I.e. very low effectiive speed indicates a bad relation between drive and medium and announces failure to come soon. https://bugs.kde.org/attachment.cgi?id=107725 looks like good relation for 4x speed and mediocre for 6x speed. You may ask the drive with an unused medium for the speed list by dvd+rw-mediainfo /dev/sr0 which will reply something like Write Speed #0: 8.0x4495=35968KB/s Write Speed #1: 6.0x4495=26976KB/s Write Speed #2: 4.0x4495=17984KB/s ------------------------------------------------------------------------- Defect management can be avoided on BD-R media by adding -use-the-force-luke=spare=none to the list of extra options for growisofs. It will then skip formatting the BD-R medium before writing begins. In my olde Debian 8 K3B this would be: Pulldown menu: Settings Item: Configure K3B Side bar icon: Programs Tab: User Parameters Line: growisofs Click at column: Parameters Write the text: -use-the-force-luke=spare=none The BD-R will have full nominal capacity and will be burnt at increasing speed up to reaching full nominal speed near the end. Noise might be substantial. On BD-RE it cannot be avoided to format the medium. Above option might or might not lead to full speed. The medium will have nominal capacity. The only way to bring BD-RE to full speed is the option stream_recording=on of backend program cdrskin (or command -stream_recording of xorriso, or burn option Stream Recording in Xfburn). Have a nice day :) Thomas
I meant "the only sure way to bring BD-RE to full speed". Some few drives burn at full speed if there is no Spare Area with replacement blocks.
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This bug has been in NEEDSINFO status with no change for at least 30 days. The bug is now closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging Thank you for helping us make KDE software even better for everyone!