cdrecord and BD-RE: writes at average 1x instead of 2x
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
--
giulioo@pobox.com
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