Before I go off to the computer store to replace a DVD

Wed Apr 25 11:49:14 UTC 2007

Randall Stewart <rrs at cisco.com> wrote:

> I have begun having difficulty with my DVD-backup that happens
> every night.
> 
> It WAS working.. but now I am seeing (on creating my initial backup):
> ***************************************************************
> bash-lakerest.net: growisofs -Z /dev/cd0 -R -J backup_init.04-24-2007.gz
> Executing 'mkisofs -R -J backup_init.04-24-2007.gz | builtin_dd 
> of=/dev/pass0 obs=32k seek=0'
>    1.49% done, estimate finish Wed Apr 25 06:49:25 2007

>   99.60% done, estimate finish Wed Apr 25 06:50:20 2007
> Total translation table size: 0
> Total rockridge attributes bytes: 266
> Total directory bytes: 0
> Path table size(bytes): 10
> Max brk space used 3440e4
> 336353 extents written (656 MB)
> builtin_dd: 336368*2KB out @ average 5.8x1385KBps
> /dev/pass0: flushing cache
> :-( unable to TEST UNIT READY: Input/output error
> :-[ SYNCHRONOUS FLUSH CACHE failed with SK=2h/ASC=04h/ACQ=07h]: Resource 
> temporarily unavailable
> **********************************************************
> And on the console while its progressing:
> **********************************************************
> acd0: FAILURE - READ_TOC ILLEGAL REQUEST asc=0x24 as=0x00
> acd0: FAILURE - unknown CMD (0x03) HARDWARE ERROR asc=0x08 ascq=0x01
> acd0: FAILURE - WRITE_BIG ILLEGAL REQUEST asc=0x21 ascq=0x02
> **********************************************************
> When I try to "append" to the DVD:
> **********************************************************
>   :-(  unable to pread64(2) primary volume descriptor: Input/output error
>      you most likely want to use -Z option.
> backup complete Tue Apr 24 01:03:45 EDT 2007
> **********************************************************
> 
> Now I would chalk this off to just a hardware failure (since it was
> working).. But when I try this on another machine that happens
> to have a DVD write... I get all the nice messages.. it completes
> with no errors .. and I can't mount the drive :-(
> 
> The drive that errors is a SONY..
> 'SONY    ' 'DVD RW DRU-820A ' '1.0a' Removable CD-ROM
> 
> On a 7.0 current machine.
> 
> The one that does not error but does not let me mount things is:
> 
> 'GENERIC ' 'DVD RW 8XMax    ' '140I' Removable CD-ROM
> 
> On a 6.2 machine.
> 
> Now it could be that both have failed.. my office is in
> a barn.. but it just seems strange to me .
> 
> 
> As anyone else seen these types of errors? should I just
> replace the drives?

I saw similar looking failure messages a few days ago with
cdrecord (burning DVDs) and if I remember correctly with
readcd as well (checking the burned discs).

The created discs were OK though and I don't burn
that much, so the error messages might not be new.

The drive is a LiteOn SOHW-1693S.

Fabian
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