Linux 2.4.33, cdrecord 2.01.01a38, burner and media details at the end. PC is P4 2.4GHz, 1GB RAM doing nothing but burning test.
Burner can write BD-RE at 2x CLV Media is 1x-2x (I'm waiting for new/different brand media in a few days) I understand BD-RE 1x = 4.5MB (1x Blu-ray being about 3 times 1x DVD, or at least Wikipedia says DVD 1x = 1.35MB/s, Blu-ray 1x = 4.5MB/s, decimal MBs). I formatted the BD-RE using dvd+rw-format, then I used cdrecord to write using the following options: -data padsize=512s -v driveropts=burnfree -sao ISO image is on disk (no piping from mkisofs) I saw that during the writes the cdrecord speed indicator was switching continuously every fraction of a second between 0.7x and 2.2x. Using generic SCSI-3/mmc-3 BD-RE driver (mmc_bdre). Driver flags : NO-CD BD MMC-3 BURNFREE Supported modes: PACKET SAO LAYER_JUMP Drive buf size : 2359296 = 2304 KB Drive pbuf size: 3932160 = 3840 KB FIFO size : 4194304 = 4096 KB Track 01: data 4212 MB padsize: 1 MB Total size: 4213 MB = 2157205 sectors Current Secsize: 2048 Trying to clear drive status. Blocks total: 11826176 Blocks current: 11826176 Blocks remaining: 9668971 Starting to write CD/DVD/BD at speed 2 in real SAO mode for single session. Last chance to quit, starting real write in 9 seconds 8 seconds 7 ... ... Track 02: 4208 of 4212 MB written (fifo 100%) [buf 97%] 0.7x. Track 02: 4209 of 4212 MB written (fifo 100%) [buf 93%] 2.2x. Track 02: 4210 of 4212 MB written (fifo 100%) [buf 97%] 0.7x Track 02: 4211 of 4212 MB written (fifo 100%) [buf 93%] 2.2x Track 02: 4212 of 4212 MB written (fifo 100%) [buf 97%] 0.7x. Track 02: 0 of 1 MB pad written. Track 02: 1 of 1 MB pad written [buf 93%] 2.3x. Track 02: Total bytes read/written: 4416907264/4417955840 (2157205 sectors). Writing time: 1009.780s Average write speed 1.0x. Min drive buffer fill was 28% Fixating... <some fixating errors> cmd finished after 0.002s timeout 1000s cmd finished after 0.002s timeout 1000s Trouble closing the session Fixating time: 0.084s cdrecord: fifo had 69571 puts and 69571 gets. cdrecord: fifo was 0 times empty and 16265 times full, min fill was 54%. 4212 MB / 1000 secs = about 4.2MB/s about Blu-ray 1x. Is there a reason why I don't get 2x? I get the same 1x average write speed even with Min drive buffer fill was 51% Min drive buffer fill was 48% I was hoping to get a speed higher that DVD 4x. Just now I read http://fy.chalmers.se/~appro/linux/DVD+RW/Blu-ray/ ===== defect management is defined for both BD-RE, rewritable media, and BD-R, write-once media. No, the latter part of the last sentence is not a joke, it is defined even for BD-R. Defect management comes with a performance penalty: most units will typically record at about 1/2 of the advertised media speed. ===== Since I already verify the copy by comparing the on disk and on DVD/BD md5sums, is there a way to disable this feature (if the 2x -> 1x is caused by this and if cdrecord too enables the feature)? btw, growisofs goes at 1x too 249757696/4194674688 ( 6.0%) @1.0x, remaining 17:22 RBU 100.0% UBU 93.1% 263815168/4194674688 ( 6.3%) @0.9x, remaining 17:23 RBU 100.0% UBU 93.1% Thanks === burner (attached via USB) http://it.lge.com/products/model/detail/masterizzatoridvd_be06lu10.jhtml Vendor_info : 'HL-DT-ST' Identifikation : 'BD-RE BE06LU10 ' Revision : 'YE03' Driver flags : NO-CD BD MMC-3 BURNFREE Supported modes: PACKET SAO LAYER_JUMP Drive buf size : 2359296 = 2304 KB Drive pbuf size: 3932160 = 3840 KB Drive DMA Speed: 11644 kB/s 66x CD 8x DVD 2x BD Current Secsize: 2048 === media info ... Current: BD-RE ... Profile: Removable Disk (current) Using generic SCSI-3/mmc-3 BD-RE driver (mmc_bdre). Driver flags : NO-CD BD MMC-3 BURNFREE Supported modes: PACKET SAO LAYER_JUMP Drive buf size : 2359296 = 2304 KB Drive pbuf size: 3932160 = 3840 KB Drive DMA Speed: 13059 kB/s 74x CD 9x DVD 2x BD Current Secsize: 2048 Disk type: 'BDW' (BD-RE) Disk class: 02 Manufacturer: 'LGEBRE' Media type: 'S01' Disk: is not in cartridge Media cartrige: write protect is off Free Spare Blocks: 393216 Alloc Spare Blocks: 393216 rzone size: 40 rzone number: 1 border number: 1 ljrs: 0 track mode: 4 copy: 0 damage: 0 reserved track: 0 blank: 0 incremental: 0 fp: 0 data mode: 1 lra valid: 0 nwa valid: 0 rzone start: 0 next wr addr: 0 free blocks: 0 blocking factor: 32 rzone size: 11826176 last recorded addr: 0 read compat lba: 0 Capacity Blklen/Sparesz. Format-type Type 11826176 12288 0x00 Formatted Media 11826176 12288 0x00 Reserved (0) 11826176 12288 0x30 Reserved (0) 11564032 20480 0x30 Reserved (0) 12088320 4096 0x30 Reserved (0) 12219392 2048 0x31 Reserved (0) Mounted media class: BD Mounted media type: BD-RE Disk Is erasable data type: standard disk status: complete session status: complete BG format status: none first track: 1 number of sessions: 1 first track in last sess: 1 last track in last sess: 1 Disk Is unrestricted Disk type: DVD, HD-DVD or BD Track Sess Type Start Addr End Addr Size ============================================== 1 1 Data 0 11826175 11826176 -1 Last session start address: 0 Last session leadout start address: 11826176 -- [EMAIL PROTECTED]