Hello, I have a SAMSUNG CD-RW (52x24x52). Previuosly I had used it successfully in RedHat 9. If I remember well , I added in grub.conf something like hdc=ide-scsi (It was quite a time ago). Now I had recently upgradced to Fedora Core 2. When booting Fedora,I see in kernel log that the SAMSUNG CD-R is being recognized as hdc.
Should I add something in grub.conf ? I saw that in 2.6 kernel there is ide-cd ; should I add somethng like hdc=ide-cd in grub.conf ? Should I specify something regarding DMA in grub.conf ? (Now there is nothing about DMA in grub.conf)
I had tried mounting the CDROM like thus: (I am not sure at all it's OK) mount -t iso9660 /dev/cdrom /mnt/cdrom but I got many errors in the log (hdc: DMA timeout retry and hdc: status error : error =0x00 and hdc: drive not ready for command).
regards, John
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John Que wrote:
I have a SAMSUNG CD-RW (52x24x52). Previuosly I had used it successfully in RedHat 9. If I remember well , I added in grub.conf something like hdc=ide-scsi (It was quite a time ago).
This is no longer needed.
Now I had recently upgradced to Fedora Core 2. When booting Fedora,I see in kernel log that the SAMSUNG CD-R is being recognized as hdc.
Should I add something in grub.conf ?
No.
I saw that in 2.6 kernel there is ide-cd ; should I add somethng like hdc=ide-cd in grub.conf ?
No.
Should I specify something regarding DMA in grub.conf ? (Now there is nothing about DMA in grub.conf)
No.
I had tried mounting the CDROM like thus: (I am not sure at all it's OK) mount -t iso9660 /dev/cdrom /mnt/cdrom but I got many errors in the log (hdc: DMA timeout retry and hdc: status error : error =0x00 and hdc: drive not ready for command).
Yes, you're right that this could be a DMA error. But forget grub.conf, it's not relevant for this.
When you say that you used this on RH9, was that on the same computer? Has anything been done internally? Especially, has anything been added or removed? Has this been working with another OS? (Are you sure it's still working?) What sort of computer is this?
Have you checked with several CDs?
Try running hdparm /dev/hdc to take a look at the state of the drive. If you find that it reports using_dma = 1 (on) then try running hdparm -d0 /dev/hdc
Then try mounting it again. If that fixes it, then copy /etc/sysconfig/harddisks to /etc/sysconfig/harddiskhdc, edit the hdc copy of the file, and change # USE_DMA=1 to USE_DMA=0
Hope this helps,
James.
I had this problem -- I just added the following to my grub.conf:
kernel /boot/vmlinuz-2.6.8-1.521 ro root=LABEL=/ hdc=ide-scsi rhgb quiet
This makes it work: I found the fix searching on the web.
HTH!
--- James Wilkinson james@westexe.demon.co.uk wrote:
John Que wrote:
I have a SAMSUNG CD-RW (52x24x52). Previuosly I had used it successfully in RedHat 9. If I remember well , I added in grub.conf something like hdc=ide-scsi (It was quite a time ago).
This is no longer needed.
Now I had recently upgradced to Fedora Core 2. When booting Fedora,I see in kernel log that the SAMSUNG CD-R is being recognized as hdc.
Should I add something in grub.conf ?
No.
I saw that in 2.6 kernel there is ide-cd ; should I add somethng like hdc=ide-cd in grub.conf ?
No.
Should I specify something regarding DMA in grub.conf ? (Now there is nothing about DMA in grub.conf)
No.
I had tried mounting the CDROM like thus: (I am not sure at all it's OK) mount -t iso9660 /dev/cdrom /mnt/cdrom but I got many errors in the log (hdc: DMA timeout retry and hdc: status error : error =0x00 and hdc: drive not ready for command).
Yes, you're right that this could be a DMA error. But forget grub.conf, it's not relevant for this.
When you say that you used this on RH9, was that on the same computer? Has anything been done internally? Especially, has anything been added or removed? Has this been working with another OS? (Are you sure it's still working?) What sort of computer is this?
Have you checked with several CDs?
Try running hdparm /dev/hdc to take a look at the state of the drive. If you find that it reports using_dma = 1 (on) then try running hdparm -d0 /dev/hdc
Then try mounting it again. If that fixes it, then copy /etc/sysconfig/harddisks to /etc/sysconfig/harddiskhdc, edit the hdc copy of the file, and change # USE_DMA=1 to USE_DMA=0
Hope this helps,
James.
-- E-mail address: james | The sendmail configuration file is one of those @westexe.demon.co.uk | files that looks like someone beat their head on | the keyboard. After working with it... I can see | why!
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Am Mo, den 04.10.2004 schrieb Globe Trotter um 1:21:
I had this problem -- I just added the following to my grub.conf:
kernel /boot/vmlinuz-2.6.8-1.521 ro root=LABEL=/ hdc=ide-scsi rhgb
quiet
This makes it work: I found the fix searching on the web.
A "fix" for what?
http://fedora.redhat.com/docs/release-notes/
"The 2.6 kernel provides a new and much-improved mechanism (known as SG_IO) for applications that must send raw commands to storage devices. This includes applications for burning CDs or for extracting data from audio CDs. SG_IO also eliminates the need for ide-scsi emulation, where boot-time parameters such as hdd=ide-scsi were required to support ATAPI CD burners."
Alexander
On Sun, 2004-10-03 at 02:53, John Que wrote:
Hello, I have a SAMSUNG CD-RW (52x24x52). Previuosly I had used it successfully in RedHat 9. If I remember well , I added in grub.conf something like hdc=ide-scsi (It was quite a time ago). Now I had recently upgradced to Fedora Core 2. When booting Fedora,I see in kernel log that the SAMSUNG CD-R is being recognized as hdc.
Should I add something in grub.conf ? I saw that in 2.6 kernel there is ide-cd ; should I add somethng like hdc=ide-cd in grub.conf ? Should I specify something regarding DMA in grub.conf ? (Now there is nothing about DMA in grub.conf)
I had tried mounting the CDROM like thus: (I am not sure at all it's OK) mount -t iso9660 /dev/cdrom /mnt/cdrom but I got many errors in the log (hdc: DMA timeout retry and hdc: status error : error =0x00 and hdc: drive not ready for command).
Is the CDROM a CD-RW, a completed CD-R, or a purchased data CDROM ? If it is a CD-RW that has been used and not closed as CD-R then it is a UDF filesystem and mounting it as iso9660 will not work.
My fstab has options for iso9660 or UDF for each CDROM drive I have. When I insert a CD it automounts the disk in either drive.
You should be able to mount a cdrom by using "mount /mnt/cdrom" without the options or device as long as the line is in fstab.
regards, John
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