[sclug] Problem with CD drives after rebuild

[Neil Haughton]

Hi Alex,

Answers inserted below. At the risk of labouring the point, all I have done
as far as I am aware is move kit from one case to a smaller case. On the
face of it all that has changed is the sheet-metal work:

2009/4/11 Alex Butcher <lug at assursys.co.uk>

> On Sat, 11 Apr 2009, Neil Haughton wrote:
>
>  $ mount /dev/hdd
>> mount: No medium found
>>
>> Any ideas?
>>
>
> What does running
>
>        hdparm -i /dev/hdc && hdparm -i /dev/hdd
>
> as root say?


$ sudo hdparm -i /dev/hdc
[sudo] password for neil:

/dev/hdc:

 Model=SAMSUNG DVD-ROM SD-616F, FwRev=F100, SerialNo=
 Config={ Fixed Removeable DTR<=5Mbs DTR>10Mbs nonMagnetic }
 RawCHS=0/0/0, TrkSize=0, SectSize=0, ECCbytes=0
 BuffType=unknown, BuffSize=0kB, MaxMultSect=0
 (maybe): CurCHS=0/0/0, CurSects=0, LBA=yes, LBAsects=0
 IORDY=yes, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
 PIO modes:  pio0 pio1 pio2 pio3 pio4
 DMA modes:  sdma0 sdma1 sdma2 mdma0 mdma1 mdma2
 UDMA modes: udma0 udma1 *udma2
 AdvancedPM=no

 * signifies the current active mode

neil at study:~$ sudo hdparm -i /dev/hdd

/dev/hdd:

 Model=HL-DT-ST GCE-8483B, FwRev=B105, SerialNo=
 Config={ Fixed Removeable DTR<=5Mbs DTR>10Mbs nonMagnetic }
 RawCHS=0/0/0, TrkSize=0, SectSize=0, ECCbytes=0
 BuffType=unknown, BuffSize=0kB, MaxMultSect=0
 (maybe): CurCHS=0/0/0, CurSects=0, LBA=yes, LBAsects=0
 IORDY=yes, tPIO={min:227,w/IORDY:120}, tDMA={min:120,rec:120}
 PIO modes:  pio0 pio1 pio2 pio3 pio4
 DMA modes:  mdma0 mdma1 mdma2
 UDMA modes: udma0 udma1 *udma2
 AdvancedPM=no

 * signifies the current active mode



>
>
> What happens if you run
>
>        eject /dev/hdc
>
> and
>        eject /dev/hdd
> ?


Both open the drive drawers as you would expect.

>
>
> What's the output of
>
>        ls -Al /dev | grep 'hd[cd]'

?


$ ls -Al /dev | grep 'hdd'
lrwxrwxrwx 1 root   root             3 2009-04-12 10:32 cdrom1 -> hdd
lrwxrwxrwx 1 root   root             3 2009-04-12 10:32 cdrw1 -> hdd
brw-rw---- 1 root   cdrom      22,  64 2009-04-12 10:32 hdd

 $ ls -Al /dev | grep 'hdc'
lrwxrwxrwx 1 root   root             3 2009-04-12 10:32 cdrom -> hdc
lrwxrwxrwx 1 root   root             3 2009-04-12 10:32 dvd -> hdc
brw-rw---- 1 root   cdrom      22,   0 2009-04-12 10:32 hdc


In conclusion, it looks to me that the drives are correctly wired up, the OS
can see and  operate them, and YET, I cannot mount an inserted CD.  What
happens is this: with no CD in the drive,

$ mount /dev/hdd

has the immediate response

mount: No medium found

Doing the same command with a CD in the drawer results in the drawer
closing, a long pause with the CD light flashing, then the same output
message - no medium found.

$ mount /dev/hdc

has the immediate response

mount: No medium found

ON the other hand, doing the same command with a CD in the drawer results in
the drawer closing, then the CD spins up to full speed and that's that, it
stays that way. The machine is virtually unusable because it seems to be IO
bound. I can get a response to keyboard/mouse at about 10 second intervals.
A top command shows nothing particularly using processor cycles so I guess
it must be an IO issue. Even issuing a shutdown command as root will not
work. I eventually have to switch off or do a hard reset.

Have I just got two non-working drives? I suppose it is possible that in
transferring both drives to the new case they could both have become
physically damaged, careful though I was, but it seems an unlikely
probability don't you think? One perhaps, both unlikely, so I am hoping
there is something else at work here.

Regards,

Neil.




>
> Cheers,
> Alex.
>