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[bug #14758] CD boot only gives Error 25: Disk read error

From: Bob Fearnley
Subject: [bug #14758] CD boot only gives Error 25: Disk read error
Date: Mon, 10 Oct 2005 11:54:28 +0000
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.8) Gecko/20050524 Fedora/1.0.4-4 Firefox/1.0.4


                 Summary: CD boot only gives Error 25: Disk read error
                 Project: GNU GRUB
            Submitted by: electron1948
            Submitted on: Mon 10/10/05 at 11:54
                Category: Booting
                Severity: Major
                Priority: 5 - Normal
              Item Group: Software Error
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: Bob Fearnley
        Originator Email: electron[**]fearnleys.org.uk
             Open/Closed: Open
                 Release: V0.95
         Reproducibility: Every Time
         Planned Release: 



Hi,  New to Linux so please bare with me.  Have read the Grub manual and
experimented for hours (in fact, days) but cannot get past the following when
trying to boot from a CD created exactly as per the manual,  using Grub 0.95:

  Booting command-list
  error 25: disk read error
  Press any key to continue

Pressing a key takes me to the menu where I can see the entries I expect. 
Have checked the entries using the edit functions and they are correct.  The
menu has the splash image from the HD.

If I drop into a command line and type *exactly* the same commands the system
will boot perfectly - into both FC4 and XP.

In grub I can also read the HD with:  'cat (hd0,14)/boot/grub/grub.conf'  and
I get the correct result.

So it seems that there is no problem  reading the HD.

Grub is installed into the linux partition and I'm booting using NTLOADER and
grub.bin - this works perfectly using the same grub.conf file.  This is only a
temporary stage so I need the boot CD to work so I can move on.

This looks like a Grub bug to me although I could well be missing the
obvious, all the info I can think of and requested in the manual is below. 
Thanks for any help.

CD contains:


grub.conf & menu.lst both contain:

  title Fedora Core (2.6.11-1.1369_FC4)
        root (hd0,14)
        kernel /boot/vmlinuz... ro root=LABEL=LINUX rhgb
        initrd /boot/initrd-2.6.11-1.1369_FC4.img
  title Windows
        rootnoverify (hd0,0)
        chainloader +1

(The above "root=LABEL=LINUX" was created during FC4 installation. 'LINUX'
was the name I entered during partition creation with Partition Magic.)


  (fd0) /dev/fd0
  (hd0) /dev/sda
  (hd1) /dev/sdb

fdisk -l gives:

address@hidden ~]# fdisk -l

Disk /dev/sda: 120.0 GB, 120034123776 bytes
255 heads, 63 sectors/track, 14593 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1        1026     8241313+   c  W95 FAT32 (LBA)
/dev/sda2            1027       14593   108976927+   f  W95 Ext'd (LBA)
/dev/sda5            1027        1039      104391    6  FAT16
/dev/sda6            1171        1798     5044378+   b  W95 FAT32
/dev/sda7            1799        2308     4096543+   b  W95 FAT32
/dev/sda8            2309        2818     4096543+   b  W95 FAT32
/dev/sda9            2819        6102    26378698+   b  W95 FAT32
/dev/sda10           6103        6362     2088418+   b  W95 FAT32
/dev/sda11           6363        6486      995998+   6  FAT16
/dev/sda12           6487        6996     4096543+   b  W95 FAT32
/dev/sda13           6997        7124     1028128+   b  W95 FAT32
/dev/sda14           7125        7188      514048+  82  Linux swap / Solaris
/dev/sda15           7189        8463    10241406   83  Linux

(same for sdb as this is RAID)


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