MESSAGE
| DATE | 2016-06-08 |
| FROM | Rick Moen
|
| SUBJECT | Re: [Hangout-NYLXS] cdrom readers
|
Quoting Ruben Safir (mrbrklyn-at-panix.com):
> On 06/08/2016 01:42 PM, Ruben Safir wrote:
>
> > VLC media player 2.2.3 Weatherwax (revision 2.2.3-0-g7370183)
> > [0000000000b3d708] pulse audio output error: PulseAudio server
> > connection failure: Connection refused
To misquote Jamie Zawinski, 'A man once had problems with audio support
on *ix, and thought "I know! I'll use PulseAudio!" Now, he had _two_
problems.'
> [ 2146.482639] Buffer I/O error on dev sr0, logical block 16, async page
> read
> [ 2146.492636] sr 2:0:0:0: [sr0] tag#25 UNKNOWN(0x2003) Result:
> hostbyte=0x00 driverbyte=0x08
> [ 2146.492640] sr 2:0:0:0: [sr0] tag#25 Sense Key : 0x5 [current]
^^^^^^^^^
This is typically a physical read error.
Quoting http://blog.disksurvey.org/knowledge-base/scsi-sense/ for
background:
'A SCSI sense buffer is the error reporting facility in SCSI. It
reports the error code and possibly also additional information
that helps to locate the source of the problem so the administrator
or developer can help resolve the issue. [...]'
0x5 (hexadecimal five) is listed on that page as:
Illegal Request -- mostly a programming error, maybe the device
handles an older standard with some bits unsupported
You might be able to guesstimate a little more by reading the tea leaves
of that diagnostic output, but my instinct and experence says that any
time you see SCSI Sense Key errors, you're seeing problems with the
physical reads/writes. In the case of optical media, that _can_ mean
just a problem with the physical optical disc, rather than the drive.
Disambiguating problem with media from problem with drive obviously thus
requires more exploration.
(For those who don't know, ATAPI drives on PATA or SATA, like basically
every other type of mass storage these days, use the Linux SCSI software
layer and therefore are addressed as SCSI-type devices using SCSI
command language -- irrespective of their not being actually SCSI.)
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