What does it mean when i get this message from a single evil DVD+RW media : :-[ WRITE@LBA=26770h failed with SK=4h/ASC=A0h/ACQ=80h]: Input/output error
ASC=A0h is from reserved range, meaning that vendors are free to assign own meanings to these error codes, consequently meaning that only LG will be able to say what does this particular code mean exactly.
I use three new DVD+RW media out of the same box and get three very different results : #1 : writes at speed about 2x . Result verifies ok. Media can be rewritten without problems. #3 : writes at speed about 4x . Result verifies ok. Media can be rewritten without problems. #2 : fails after 300 MB 322306048/3946780672 ( 8.2%) @2.2x, remaining 17:14 322666496/3946780672 ( 8.2%) @0.1x, remaining 17:47 :-[ WRITE@LBA=26770h failed with SK=4h/ASC=A0h/ACQ=80h]: Input/output error builtin_dd: 157552*2KB out @ average 2.4x1385KBps :-( write failed: Input/output error /dev/sr0: flushing cache :-[ FLUSH CACHE failed with SK=4h/ASC=09h/ACQ=01h]: Input/output error Now the whole system hangs. I pressed the eject button of the DVD burner. Ten minutes later themedia got ejected. System still hanging. I waited an hour and then had to press the reset button of the computer.Sometimes the end is more graceful: growisofs ends with an exit value of 0 . First i believed that DMA and/or growisofs version had an influence but now i think that the particular media just gets more and more evil.
It apparently does. It does sound like a media defect of some sort. I bet both unit and kernel could have handled it in more graceful way, better than system lock-up. But they didn't and that's life... I have received one similar report, LG unit terminating recording with above sense code with RICOHJPN/W01 mediaid. After my reply to "if problem persists over several brands, then unit is defective and you should talk to your vendor," the user never heard back. So I suppose same is applicable in your case.
Both media which do not fail show intermediate states of slowliness while getting written (regardless of DMA) : 1573978112/4700372992 (33.5%) @3.2x, remaining 11:59 1574961152/4700372992 (33.5%) @0.2x, remaining 12:04 1574993920/4700372992 (33.5%) @0.0x, remaining 12:10 1581416448/4700372992 (33.6%) @1.4x, remaining 12:13 1595932672/4700372992 (34.0%) @3.1x, remaining 12:09 I found this : http://lists.debian.org/cdwrite/2004/03/msg00126.html
That post refers to ZCLV recording, when the speed is supposed to increase during recording at zone boundaries. ZCLV is not implemented by all units and so far was observed with DVD+R only. You're referring to DVD+RW recording and for whatever reason it slows down, it's different. But what you should try to figure out is why 3x? I suppose expected speed was 4x. As mentioned earlier 3x sound very much like lack of DMA...
Freshly installed SuSE. Therefore i am not 100% sure wether really no automounter is active. But at least DVDs and CDs in ISO format do not mount automatically.
Keep in mind that "automounter issues" apply in first hand to DVD+R and DVD-dash. DVD+RW recordings can't get busted by automounting activities. Recordings can slow down, but they shouldn't get busted, as DVD+RW is true random access media.
This is from a gracefully ended try with growisofs-5.12 :
This is odd. Kernel complained as hell and growisofs didn't say a thing and completed gracefully? Or do you mean "gracefully" as "it complained, but sysytem didn't lock-up"? Well, one way or another, just discard that particular media and keep trying. If problem persists over several medias and brands, and if you're positive it's not some interference with another program such as automounting factility, then talk to your vendor. A.