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Old 02-08-2012, 05:17 PM   #31
Chris.Bristol
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Message 21:

Quote:
Look at the [relevant] output of dmesg


[ 2.224354] sda: sda1 sda2 < sda5 sda6 >
[ 2.268427] sd 2:0:0:0: [sda] Attached SCSI disk
[ 2.295672] sr0: scsi3-mmc drive: 40x/40x writer dvd-ram cd/rw xa/form2 cdda tray
[ 2.295678] Uniform CD-ROM driver Revision: 3.20
[ 2.295841] sr 2:0:1:0: Attached scsi CD-ROM sr0
[ 2.304518] sd 2:0:0:0: Attached scsi generic sg0 type 0
[ 2.304582] sr 2:0:1:0: Attached scsi generic sg1 type 5

Quote:
Look under /dev/
block fd loop5 psaux sdb tty tty20 tty33 tty46 tty59 urandom vcsa5
bsg full loop6 ptmx sdc tty0 tty21 tty34 tty47 tty6 vcs vcsa6
bus fuse loop7 pts sg0 tty1 tty22 tty35 tty48 tty60 vcs1 vcsa7
cdrom fw0 lp0 random sg1 tty10 tty23 tty36 tty49 tty61 vcs2 vga_arbiter
cdrw hpet MAKEDEV rfkill sg2 tty11 tty24 tty37 tty5 tty62 vcs3 xconsole
char initctl mcelog root sg3 tty12 tty25 tty38 tty50 tty63 vcs4 zero
console input mem rtc shm tty13 tty26 tty39 tty51 tty7 vcs5
core kmsg net rtc0 snapshot tty14 tty27 tty4 tty52 tty8 vcs6
cpu_dma_latency log network_latency scd0 snd tty15 tty28 tty40 tty53 tty9 vcs7
disk loop0 network_throughput sda sndstat tty16 tty29 tty41 tty54 ttyS0 vcsa
dri loop1 null sda1 sr0 tty17 tty3 tty42 tty55 ttyS1 vcsa1
dvd loop2 parport0 sda2 stderr tty18 tty30 tty43 tty56 ttyS2 vcsa2
dvdrw loop3 port sda5 stdin tty19 tty31 tty44 tty57 ttyS3 vcsa3
fb0 loop4 ppp sda6 stdout tty2 tty32 tty45 tty58 uinput vcsa4


Quote:
Look under /sys/block
loop0 loop1 loop2 loop3 loop4 loop5 loop6 loop7 sda sdb sdc sr0

I reckon that means that it is sr0

Last edited by Chris.Bristol; 02-12-2012 at 06:47 PM.
 
Old 02-12-2012, 06:50 PM   #32
Chris.Bristol
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This is no longer a problem now I have fixed some other problems which arose later, see thread 937690

Last edited by Chris.Bristol; 04-16-2012 at 09:17 PM.
 
Old 11-15-2012, 07:01 PM   #33
Chris.Bristol
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I've finally found out what the problem is. Nothing to do with the operating system or firmware.

The proof of it not being an OS problem is that it still happens if you disconnect the ribbon cable. The statement in my post #28 that it worked without the ribbon cable is unfortunate as it must just have worked once or twice by chance.

There is a round magnetic puck (that clamps the disc from above as the drawer closes). If motor belt driving the drawer is slack or slippery it can't overcome its attraction to the drive spindle.

The proof that it is a mechanical problem is that if you temporarily remove the puck without a disk in the problem stops.

Other symptoms are:
  • a loud "clunk" when it fails to open
  • it sometimes needs a helping hand to close
  • sometimes seems to think it's open when it's closed and vice versa

Solution: Open the drive case and clean the belt and associated pulleys with methylated spirit to get the belt gripping better. I would also very sparingly grease (not oil) the gear teeth.

I have fixed two drives like this.

The original information came from http://www.tomshardware.co.uk/forum/...ject-disc-tray Don't follow the advice to make a spacer from tape to move the two magnets apart to reduce the magnetic attraction, as the disk won't be held tightly enough. Even if you test it and the disk doesn't wobble, the grip isn't good enough and it can slip. Two methods are mentioned, one is better than the other but it is still not recommended.

I can't remember what I as on about in post #32!

Last edited by Chris.Bristol; 11-15-2012 at 07:16 PM.
 
  


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