Re: external cdrw


Subject: Re: external cdrw
From: John Schmidt (jas@netbrick.com)
Date: Thu Feb 28 2002 - 15:27:04 MST


Do you know if the cdrw is an ultra-scsi device? I have an orb drive
connected to a PT Pro 200's exernal scsi port and I know this drive is an
ultra-scsi device. The reason why I ask is that I have had problems reading
and writing to the orb drive which I believe is due to the nature of the
scsi2 : 53C94 driver not working reliably with an ultra scsi device. This is
pure speculation on my part, but I do have an external zip drive which is not
ultra-scsi and it works fine.

John Schmidt
jas@netbrick.com

On Thursday 28 February 2002 03:09 pm, you wrote:
> Initially I had my Yamaha 8424 cdrw replacing the cdrom drive. I finally
> got an external case to I put the origional cdrom back into my 8500. It
> works fine. So then I connected the cdrw to the external scsi bus. It works
> fine in MacOS but when I try to mount a cd in linux it says "input/output
> error". The kernel recognises the drive during boot
>
> root@dhcp-499-45.<13>~: dmesg | less
> .
> .
> .
> SCSI subsystem driver Revision: 1.00
> scsi0 : SCSI host adapter emulation for IDE ATAPI devices
> scsi1 : MESH
> mesh: target 0 synchronous at 5.0 MB/s
> mesh: rejecting message from target 0: 1 6 4 c 0 3f 1 2
> mesh: rejecting message from target 0: 1 2 3 1
> mesh: target 0 synchronous at 5.0 MB/s
> Vendor: WDIGTL Model: WDE9150 ULTRA3 Rev: 1.30
> Type: Direct-Access ANSI SCSI revision: 03
> mesh: target 1 synchronous at 5.0 MB/s
> Vendor: MATSHITA Model: CD-ROM CR-8008 Rev: 8.0e
> Type: CD-ROM ANSI SCSI revision: 02
> mesh: target 3 synchronous at 5.0 MB/s
> Vendor: SEAGATE Model: ST34502LW Rev: 7503
> Type: Direct-Access ANSI SCSI revision: 02
> scsi2 : 53C94
> Vendor: YAMAHA Model: CRW8424S Rev: 1.0j
> Type: CD-ROM ANSI SCSI revision: 02
> Attached scsi disk sda at scsi1, channel 0, id 0, lun 0
> Attached scsi disk sdb at scsi1, channel 0, id 3, lun 0
> SCSI device sda: 17873040 512-byte hdwr sectors (9151 MB)
> Partition check:
> /dev/scsi/host1/bus0/target0/lun0: [mac] p1 p2 p3 p4 p5 p6 p7
> SCSI device sdb: 8888924 512-byte hdwr sectors (4551 MB)
> /dev/scsi/host1/bus0/target3/lun0: [mac] p1 p2 p3 p4 p5 p6 p7 p8
> Attached scsi CD-ROM sr0 at scsi1, channel 0, id 1, lun 0
> Attached scsi CD-ROM sr1 at scsi2, channel 0, id 1, lun 0
> sr0: scsi-1 drive
> Uniform CD-ROM driver Revision: 3.12
> sr1: scsi3-mmc drive: 24x/16x writer cd/rw xa/form2 cdda tray
>
> I added this to my fstab
> /dev/cdrom /mnt/cdrom auto
> noauto,ro,user 0 0 /dev/cdrw /mnt/cdrw auto
> noauto,ro,user 0 0
>
> Created the mount point
> root@dhcp-499-45.<16>/mnt: la
> total 24
> drwxr-xr-x 6 root root 4096 Feb 28 15:26 ./
> drwxr-xr-x 17 root root 4096 Feb 28 15:24 ../
> drwxrwxr-x 2 root roberts 4096 Feb 16 19:45 Grinch/
> drwxrwxr-x 2 root roberts 4096 Oct 9 1998 cdrom/
> drwxrwxr-x 2 root roberts 4096 Feb 28 15:26 cdrw/
> drwxrwxr-x 2 root roberts 4096 Feb 6 1996 floppy/
>
> and set up the device links
> root@dhcp-499-45.<19>/dev: la cdr*
> lrwxrwxrwx 1 root roberts 9 Jan 30 12:17 cdrom -> /dev/scd0
> lrwxrwxrwx 1 root roberts 9 Feb 28 15:29 cdrw -> /dev/scd1
> brw------- 1 roberts disk 11, 0 Jul 25 2001 scd0
> brw-rw---- 1 roberts disk 11, 1 Jul 25 2001 scd1
>
> Is there anything I missed? One thing I noticed is that the scsi cd links
> only go from scd0-scd7. There is no way to distinguish between the internal
> and external busses. And one last thing, I can eject the cd by right
> clicking on my desktop simlink so I think the links are set up properly.
>
> -Rob



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