I want both my CD drives to be visible under K3b. If I let the CDROM
load up with the ide-cd kernel driver, all works well. But I want both the
CDROM and my CDRW to be accessed with the ide-scsi kernel driver.
When I do this, the CDROM drive gives I/O errors. Any ideas?

Background:

Mandrake auto-setup my CDROM through the ide-cd module. It
set up my CDRW through the ide-scsi driver module. And everything
works this way except K3b can't see the CDROM without the SCSI
emulating driver. So, I set about the make *both* CDs come on-line
throught he SCSI driver..

I used instructions from
http://www-106.ibm.com/developerwork.../l-cdburn.html
which worked fine except the modification to modules.conf had a
slightly different syntax, which I found in the documentation that
came with Mandrake:
file:/usr/share/doc/HOWTO/HTML/en/CD-Writing/CD-Writing-HOWTO-2.html#ss2.1
portion of the documentation that comes with Mandrake (this HOWTO is
also available elsewhere on the web).

Briefly, my system has
hda - 80 GB
hdb - 6 GB
hdc - CDROM
hdd - CDRW

I modified the LILO boot to pass the proper commands to the kernel
and then reran the command lilo to accept the /etc/lilo.conf file changes:

boot=/dev/hda
map=/boot/map
vga=normal
default="linux"
keytable=/boot/us.klt
prompt
nowarn
timeout=70
message=/boot/message
menu-scheme=wb:bw:wb:bw
image=/boot/vmlinuz
label="linux"
root=/dev/hda5
initrd=/boot/initrd.img
append="quiet devfs=mount hdc=ide-scsi hdd=ide-scsi acpi=off"
vga=788
read-only

I modified the /etc/modules.conf to force the IDE driver to *not* take
the hdc CDROM drive (the syntax of the ignore command is what
was different in the two references quoted above):

probeall scsi_hostadapter ide-scsi usb-storage
alias eth0 sis900
above snd-intel8x0 snd-pcm-oss
alias sound-slot-0 snd-intel8x0
probeall usb-interface usb-ohci
add options ide-cd "ignore=hdc"

Lastly, I edited /etc/fstab to mount up the newly named drive:

/dev/hda5 / ext3 defaults 1 1
none /dev/pts devpts mode=0620 0 0
/dev/hda7 /home ext3 defaults 1 2
none /mnt/cdrw supermount
dev=/dev/scd1,fs=auto,ro,--,iocharset=iso8859-1,codepage=850,umask=0 0 0
none /mnt/cdrom supermount
dev=/dev/scd0,fs=auto,ro,--,iocharset=iso8859-1,codepage=850,umask=0 0 0
none /mnt/floppy supermount
dev=/dev/fd0,fs=auto,--,iocharset=iso8859-1,sync,codepage=850,umask=0 0 0
/dev/hda1 /mnt/winxp ntfs iocharset=iso8859-1,ro,umask=0 0 0
/dev/hdb1 /mnt/win98 vfat iocharset=iso8859-1,codepage=850,umask=0 0 0
/dev/sda1 /mnt/usbdrive vfat iocharset=iso8859-1,codepage=850,umask=0 0 0
none /proc proc defaults 0 0
/dev/hda6 swap swap defaults 0 0

I reboot and by watching the kernel message ring buffer (dmesg command),
all
four drives come up without error during boot. The command "cdrecord
-scanbus" also reports both up and properly identified.

SiS735 ATA 100 controller
ide0: BM-DMA at 0xff00-0xff07, BIOS settings: hdaMA, hdbMA
ide1: BM-DMA at 0xff08-0xff0f, BIOS settings: hdcMA, hddMA
hda: IC35L040AVVN07-0, ATA DISK drive
hdb: WDC AC33200L, ATA DISK drive
blk: queue c03cb420, I/O limit 4095Mb (mask 0xffffffff)
blk: queue c03cb55c, I/O limit 4095Mb (mask 0xffffffff)
hdc: GCR-8521B, ATAPI CD/DVD-ROM drive
hdd: Hewlett-Packard CD-Writer Plus 9100b, ATAPI CD/DVD-ROM drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
ide1 at 0x170-0x177,0x376 on irq 15

Cdrecord 2.0 (i586-mandrake-linux-gnu) Copyright (C) 1995-2002 Jörg
Schilling
Using libscg version 'schily-0.7'
scsibus0:
0,0,0 0) 'LEXAR ' 'DIGITAL FILM ' '/W1.' Removable Disk
0,1,0 1) *
0,2,0 2) *
0,3,0 3) *
0,4,0 4) *
0,5,0 5) *
0,6,0 6) *
0,7,0 7) *
scsibus1:
1,0,0 100) 'HL-DT-ST' 'CD-ROM GCR-8521B' '1.00' Removable CD-ROM
1,1,0 101) 'HP ' 'CD-Writer+ 9100b' '1.06' Removable CD-ROM
1,2,0 102) *
1,3,0 103) *
1,4,0 104) *
1,5,0 105) *
1,6,0 106) *
1,7,0 107) *


When I access the CDRW (hdd), everything looks fine (using dmesg again):

UDF-fs DEBUG lowlevel.c:57:udf_get_last_session: XA disk: no,
vol_desc_start=0
UDF-fs DEBUG super.c:1426:udf_read_super: Multi-session=0
UDF-fs DEBUG super.c:415:udf_vrs: Starting at sector 16 (2048 byte sectors)
UDF-fs DEBUG super.c:442:udf_vrs: ISO9660 Primary Volume Descriptor found
UDF-fs DEBUG super.c:445:udf_vrs: ISO9660 Supplementary Volume Descriptor
found
UDF-fs DEBUG super.c:451:udf_vrs: ISO9660 Volume Descriptor Set Terminator
found
UDF-fs: No VRS found
ISO 9660 Extensions: Microsoft Joliet Level 3
ISOFS: changing to secondary root

But when I access the CDROM (hdc), things go haywire:

UDF-fs DEBUG lowlevel.c:57:udf_get_last_session: XA disk: no,
vol_desc_start=0
UDF-fs DEBUG super.c:1426:udf_read_super: Multi-session=0
UDF-fs DEBUG super.c:415:udf_vrs: Starting at sector 16 (2048 byte sectors)
ide-scsi: The scsi wants to send us more data than expected - discarding
data
ide-scsi: [[ 28 0 0 0 0 10 0 0 1 0 0 0 ]
]
ide-scsi: expected 2048 got 4096 limit 2048
ide-scsi: The scsi wants to send us more data than expected - discarding
data
ide-scsi: [[ 28 0 0 0 0 11 0 0 1 0 0 0 ]
]
ide-scsi: expected 2048 got 4096 limit 2048
UDF-fs: No VRS found
ide-scsi: The scsi wants to send us more data than expected - discarding
data
ide-scsi: [[ 28 0 0 0 0 10 0 0 1 0 0 0 ]
]

....several pages of similar, ending with...

ide-scsi: expected 2048 got 4096 limit 2048
Unable to identify CD-ROM format.
MSDOS FS: IO charset iso8859-1
MSDOS FS: Using codepage 850
ide-scsi: The scsi wants to send us more data than expected - discarding
data
ide-scsi: [[ 28 0 0 0 0 0 0 0 1 0 0 0 ]
]
ide-scsi: expected 2048 got 4096 limit 2048
FAT: bogus cluster size 0
VFS: Can't find a valid FAT filesystem on dev 0b:00.
FAT: freeing iocharset=iso8859-1
MSDOS FS: IO charset iso8859-1
MSDOS FS: Using codepage 850
ide-scsi: The scsi wants to send us more data than expected - discarding
data
ide-scsi: [[ 28 0 0 0 0 0 0 0 1 0 0 0 ]
]
ide-scsi: expected 2048 got 4096 limit 2048
FAT: bogus logical sector size 207
VFS: Can't find a valid FAT filesystem on dev 0b:00.



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