Thomas, you cracked me and i finally tried out cdrskin - it behaves just like growiso, first zone ok, second zone slowly. Growis with option "speed=6" works properly, "speed=8" like without speed option. But what's interesting growiso+K3b and speed set at 6x records at 3.5 - 4x, when 8x is checked - first zone 3.5 - 4x, second 2.5 - 3x. Another test you wanted me to do before:
[EMAIL PROTECTED]:~$ growisofs -Z /dev/dvd=/dev/zero WARNING: /dev/dvd already carries isofs! About to execute 'builtin_dd if=/dev/zero of=/dev/dvd obs=32k seek=0' /dev/dvd: restarting DVD+RW format... /dev/dvd: "Current Write Speed" is 8.2x1352KBps. 18153472/4700372992 ( 0.4%) @3.7x, remaining 25:47 RBU 100.0% UBU 3.8% 45907968/4700372992 ( 1.0%) @6.0x, remaining 15:12 RBU 100.0% UBU 65.4% 73596928/4700372992 ( 1.6%) @6.0x, remaining 12:34 RBU 100.0% UBU 92.3% 101318656/4700372992 ( 2.2%) @6.0x, remaining 12:06 RBU 100.0% UBU 96.2% 129040384/4700372992 ( 2.7%) @6.0x, remaining 11:13 RBU 100.0% UBU 96.2% 156729344/4700372992 ( 3.3%) @6.0x, remaining 10:37 RBU 100.0% UBU 92.3% 184451072/4700372992 ( 3.9%) @6.0x, remaining 10:36 RBU 100.0% UBU 96.2% 212172800/4700372992 ( 4.5%) @6.0x, remaining 10:13 RBU 100.0% UBU 88.5% 232062976/4700372992 ( 4.9%) @4.3x, remaining 10:16 RBU 100.0% UBU 96.2% 254279680/4700372992 ( 5.4%) @4.8x, remaining 10:29 RBU 100.0% UBU 46.2% 286949376/4700372992 ( 6.1%) @7.1x, remaining 9:59 RBU 100.0% UBU 19.2% 319488000/4700372992 ( 6.8%) @7.0x, remaining 9:49 RBU 100.0% UBU 19.2% 352157696/4700372992 ( 7.5%) @7.1x, remaining 9:27 RBU 100.0% UBU 19.2% 384696320/4700372992 ( 8.2%) @7.0x, remaining 9:09 RBU 100.0% UBU 19.2% 417366016/4700372992 ( 8.9%) @7.1x, remaining 9:03 RBU 100.0% UBU 19.2% 450002944/4700372992 ( 9.6%) @7.1x, remaining 8:48 RBU 100.0% UBU 23.1% 482574336/4700372992 (10.3%) @7.1x, remaining 8:35 RBU 100.0% UBU 23.1% 515112960/4700372992 (11.0%) @7.0x, remaining 8:31 RBU 100.0% UBU 23.1% 547782656/4700372992 (11.7%) @7.1x, remaining 8:20 RBU 100.0% UBU 26.9% 580419584/4700372992 (12.3%) @7.1x, remaining 8:09 RBU 100.0% UBU 23.1% 613056512/4700372992 (13.0%) @7.1x, remaining 8:06 RBU 100.0% UBU 23.1% 642514944/4700372992 (13.7%) @6.4x, remaining 7:59 RBU 100.0% UBU 26.9% 675119104/4700372992 (14.4%) @7.1x, remaining 7:51 RBU 100.0% UBU 23.1% 707657728/4700372992 (15.1%) @7.0x, remaining 7:48 RBU 100.0% UBU 19.2% 740327424/4700372992 (15.8%) @7.1x, remaining 7:40 RBU 100.0% UBU 23.1% ........................ 4518215680/4700372992 (96.1%) @7.2x, remaining 0:19 RBU 100.0% UBU 26.9% 4551147520/4700372992 (96.8%) @7.1x, remaining 0:15 RBU 100.0% UBU 19.2% 4583194624/4700372992 (97.5%) @6.9x, remaining 0:12 RBU 100.0% UBU 19.2% 4616749056/4700372992 (98.2%) @7.3x, remaining 0:08 RBU 100.0% UBU 19.2% 4650139648/4700372992 (98.9%) @7.2x, remaining 0:05 RBU 100.0% UBU 19.2% 4683038720/4700372992 (99.6%) @7.1x, remaining 0:01 RBU 100.0% UBU 19.2% :-[ [EMAIL PROTECTED] failed with SK=5h/ASC=21h/ACQ=00h]: No space left on device :-( write failed: No space left on device /dev/dvd: flushing cache /dev/dvd: stopping de-icing /dev/dvd: writing lead-out Findings of another test will be tomorrow Tomasz Dnia 31 marca 2008 16:42 "Thomas Schmitt" <[EMAIL PROTECTED]> napisał(a): > Hi, > > > The main question is why does the system in question > > discriminate DVD+RW in particular. > > That would be explainable by faulty firmware > which switches speed too early. > > But why does it work with full speed when > cdrecord is used ? > Especially with DVD+RW it is not very likely > that any SCSI command before writing > would influence the drive as observed by Tomasz. > The drive only announces two speeds. > None of them is below 6x. > So growisofs should be unable to make it run slower. > > > That's why i propose a test with cdrskin. > (Elsewise growisofs is at least as capable with > DVD as is cdrskin.) > > I forgot to propose a test with plain operating > system driver: > time dd if=/dev/zero of=/dev/hdc bs=1M count=1000 > > The measured time and the size of 1000 MiB would > allow to compute the average speed. > > > Have a nice day :) > > Thomas > > > -- > To UNSUBSCRIBE, email to [EMAIL PROTECTED] > with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED] > >
