Thread: Grub Boot Error: No such Disk

hi all, apologies first post being 1 asking but....

running ubuntu server 10.04lts on home server backups , media etc somehow broke. had installed ubuntu on different partition (with lvm) data in case happened.

reinstalled os partition in hope left working system , retain data.

now, here things little complicated relevant! extended data partition on drive added after set , used sata power adaptor dvd drive power new hdd. old computer doesnt support booting usb , has 2 sata power connectors.

thinking if unplugged second hard drive contained os partition , part of data partition should able install new os without problem did (i think!). partition manager install cd couldnt read or recognise data partition since part of not plugged in see os partition installed to.

after formatting , installing onto partition grub boot error of no such disk , left grub rescue command prompt. have tried booting , without second hard drive plugged in, in case made difference.

reading around forums here found boot info script below. (i used live cd of desktop version run it)

if appreciate it, must software problem losing data massive pain!

in advance.

boot info script 0.60 17 may 2011


============================= boot info summary: ===============================

=> grub2 (v1.97-1.98) installed in mbr of /dev/sda , looks @ sector
1 of same hard drive core.img. core.img @ location ,
looks (mediaserver-root)/boot/grub on drive.
=> no boot loader installed in mbr of /dev/sdb.

sda1: __________________________________________________ ________________________

file system: ext2
boot sector type: unknown
boot sector info:
operating system:
boot files: /grub/grub.cfg /grub/core.img

sda2: __________________________________________________ ________________________

file system: extended partition
boot sector type: unknown
boot sector info:

sda5: __________________________________________________ ________________________

file system: lvm2_member
boot sector type: -
boot sector info:

sdb1: __________________________________________________ ________________________

file system: vfat
boot sector type: fat16
boot sector info: no errors found in boot parameter block.
operating system:
boot files:

============================ drive/partition info: =============================

drive: sda __________________________________________________ ___________________

disk /dev/sda: 320.1 gb, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders, total 625142448 sectors
units = sectors of 1 * 512 = 512 bytes
sector size (logical/physical): 512 bytes / 512 bytes

partition boot start sector end sector # of sectors id system

/dev/sda1 * 2,048 499,711 497,664 83 linux
/dev/sda2 501,758 625,141,759 624,640,002 5 extended
/dev/sda5 501,760 625,141,759 624,640,000 8e linux lvm


drive: sdb __________________________________________________ ___________________

disk /dev/sdb: 260 mb, 260355072 bytes
255 heads, 63 sectors/track, 31 cylinders, total 508506 sectors
units = sectors of 1 * 512 = 512 bytes
sector size (logical/physical): 512 bytes / 512 bytes

partition boot start sector end sector # of sectors id system

/dev/sdb1 63 508,472 508,410 6 fat16


"blkid" output: __________________________________________________ ______________

device uuid type label

/dev/loop0 squashfs
/dev/sda1 b5fe8c06-6beb-4d2d-861e-51c9d74d38c3 ext2
/dev/sda5 aoen99-svlz-unxy-wvae-vhyx-fuqh-mlirge lvm2_member
/dev/sdb1 f085-c5e1 vfat untitled

================================ mount points: =================================

device mount_point type options

/dev/loop0 /rofs squashfs (ro,noatime)
/dev/sdb1 /media/untitled vfat (rw,nosuid,nodev,uhelper=udisks,uid=999,gid=999,sh ortname=mixed,dmask=0077,utf8=1,showexec,flush)
/dev/sr0 /cdrom iso9660 (ro,noatime)


============================= sda1/grub/grub.cfg: ==============================

--------------------------------------------------------------------------------
#
# not edit file
#
# automatically generated /usr/sbin/grub-mkconfig using templates
# /etc/grub.d , settings /etc/default/grub
#

### begin /etc/grub.d/00_header ###
if [ -s $prefix/grubenv ]; then
load_env
fi
set default="0"
if [ ${prev_saved_entry} ]; then
set saved_entry=${prev_saved_entry}
save_env saved_entry
set prev_saved_entry=
save_env prev_saved_entry
set boot_once=true
fi

function savedefault {
if [ -z ${boot_once} ]; then
saved_entry=${chosen}
save_env saved_entry
fi
}

function recordfail {
set recordfail=1
if [ -n ${have_grubenv} ]; if [ -z ${boot_once} ]; save_env recordfail; fi; fi
}
insmod lvm
insmod ext2
set root='(mediaserver-root)'
search --no-floppy --fs-uuid --set 116a95f4-7b28-467a-a705-1d82941b738d
if loadfont /usr/share/grub/unicode.pf2 ; then
set gfxmode=640x480
insmod gfxterm
insmod vbe
if terminal_output gfxterm ; true ; else
# backward compatibility versions of terminal.mod don't
# understand terminal_output
terminal gfxterm
fi
fi
insmod ext2
set root='(hd0,1)'
search --no-floppy --fs-uuid --set b5fe8c06-6beb-4d2d-861e-51c9d74d38c3
set locale_dir=($root)/grub/locale
set lang=c.utf-8
insmod gettext
if [ ${recordfail} = 1 ]; then
set timeout=-1
else
set timeout=10
fi
### end /etc/grub.d/00_header ###

### begin /etc/grub.d/05_debian_theme ###
set menu_color_normal=white/black
set menu_color_highlight=black/light-gray
### end /etc/grub.d/05_debian_theme ###

### begin /etc/grub.d/10_linux ###
menuentry 'ubuntu, linux 2.6.32-28-server' --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
insmod ext2
set root='(hd0,1)'
search --no-floppy --fs-uuid --set b5fe8c06-6beb-4d2d-861e-51c9d74d38c3
linux /vmlinuz-2.6.32-28-server root=/dev/mapper/mediaserver-root ro quiet
initrd /initrd.img-2.6.32-28-server
}
menuentry 'ubuntu, linux 2.6.32-28-server (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
insmod ext2
set root='(hd0,1)'
search --no-floppy --fs-uuid --set b5fe8c06-6beb-4d2d-861e-51c9d74d38c3
echo 'loading linux 2.6.32-28-server ...'
linux /vmlinuz-2.6.32-28-server root=/dev/mapper/mediaserver-root ro single
echo 'loading initial ramdisk ...'
initrd /initrd.img-2.6.32-28-server
}
### end /etc/grub.d/10_linux ###

### begin /etc/grub.d/20_memtest86+ ###
menuentry "memory test (memtest86+)" {
insmod ext2
set root='(hd0,1)'
search --no-floppy --fs-uuid --set b5fe8c06-6beb-4d2d-861e-51c9d74d38c3
linux16 /memtest86+.bin
}
menuentry "memory test (memtest86+, serial console 115200)" {
insmod ext2
set root='(hd0,1)'
search --no-floppy --fs-uuid --set b5fe8c06-6beb-4d2d-861e-51c9d74d38c3
linux16 /memtest86+.bin console=ttys0,115200n8
}
### end /etc/grub.d/20_memtest86+ ###

### begin /etc/grub.d/30_os-prober ###
if [ ${timeout} != -1 ]; then
if keystatus; then
if keystatus --shift; then
set timeout=-1
else
set timeout=0
fi
else
if sleep --interruptible 3 ; then
set timeout=0
fi
fi
fi
### end /etc/grub.d/30_os-prober ###

### begin /etc/grub.d/40_custom ###
# file provides easy way add custom menu entries. type the
# menu entries want add after comment. careful not change
# 'exec tail' line above.
### end /etc/grub.d/40_custom ###
--------------------------------------------------------------------------------

=================== sda1: location of files loaded grub: ====================

gib - gb file fragment(s)

0.119218826 = 0.128010240 grub/core.img 2
0.122201920 = 0.131213312 grub/grub.cfg 1
0.028848648 = 0.030976000 initrd.img-2.6.32-28-server 37
0.010981560 = 0.011791360 vmlinuz-2.6.32-28-server 18

======================== unknown mbrs/boot sectors/etc: ========================

unknown bootloader on sda1

00000000 de 28 c1 36 49 1a 79 eb c8 91 6a ea 23 22 d4 52 |.(.6i.y...j.#".r|
00000010 7f 24 00 cb 21 5d 92 5d 18 c5 22 ee d9 0e ff 9d |.$..!].]..".....|
00000020 a0 80 58 9e 24 f9 bf a8 0e 68 69 34 3f 80 3c 33 |..x.$....hi4?.<3|
00000030 7c 32 e1 f9 09 f9 f9 89 da f8 81 01 75 c4 13 6b ||2..........u..k|
00000040 32 bb e5 b0 46 78 b0 3e 77 da 13 1c 36 a1 94 c0 |2...fx.>w...6...|
00000050 29 43 43 33 3c c1 ff 8d 64 0f 07 7f 04 3c 49 eb |)cc3<...d....<i.|
00000060 06 3c 67 bb e7 0d cc fb 3c 74 75 d0 3b 04 4b 0f |.<g.....<tu.;.k.|
00000070 09 0e 03 78 96 c0 03 b8 3f a9 54 32 26 20 42 aa |...x....?.t2& b.|
00000080 b0 06 1a 3f 13 23 18 9c ff 2f 28 a0 0d 3e 34 53 |...?.#.../(..>4s|
00000090 19 23 19 b1 8c 54 27 ed e5 7d 6b c0 48 eb 00 25 |.#...t'..}k.h..%|
000000a0 06 43 fa 4f 32 de 48 69 ef 43 0f 72 6f 6c 2d 43 |.c.o2.hi.c.rol-c|
000000b0 0a 5b 44 82 9a 7f 06 62 65 bd 5e 38 6c a1 2c 06 |.[d....be.^8l.,.|
000000c0 dc e9 1d 67 ea 84 92 01 8c 91 8b 48 7e 0e 0c fc |...g.......h~...|
000000d0 21 e9 29 83 f9 b3 fa 8d c0 d6 4d 3b e9 a1 fe 30 |!.).......m;...0|
000000e0 d7 eb 06 55 70 20 cb a6 69 16 85 b0 f0 d6 98 00 |...up ..i.......|
000000f0 62 68 bd 06 10 59 a7 9b b8 5c df 9a 57 98 e8 98 |bh...y...\..w...|
00000100 fb 22 19 67 e9 ff 70 ec e8 dc 5e ff 35 1c ba 60 |.".g..p...^.5..`|
00000110 1e a9 a1 d9 2d 6a 1a 6f 43 1f 30 da 12 e3 b6 60 |....-j.oc.0....`|
00000120 c1 eb d7 8d 42 51 51 78 68 58 d6 cf 0e df 21 eb |....bqqxhx....!.|
00000130 5a eb bc 29 2c 28 5c e4 9d f6 21 5f eb a7 5f 56 |z..),(\...!_.._v|
00000140 56 34 5f c6 9e 80 3e 5b eb 8c 28 1f 86 bc 9d 24 |v4_...>[..(....$|
00000150 84 d7 0d 24 64 41 45 59 f9 af 00 75 2f 2a 4e e7 |...$daey...u/*n.|
00000160 fa 0f 81 7f 42 78 04 39 fa 74 07 66 39 3a 01 c0 |....bx.9.t.f9:..|
00000170 da 75 ef 40 2d 28 98 40 37 c4 a3 76 40 58 85 70 |.u.@-(.@7..v@x.p|
00000180 0c 6a 17 09 f0 b5 80 07 e2 57 ff 10 a0 e5 5b e6 |.j.......w....[.|
00000190 c4 a2 3a b3 ab 68 98 07 ed 37 dc 0c 23 6a 01 2b |..:..h...7..#j.+|
000001a0 01 eb 1c 5b 43 80 9c 1a 87 7f bf d7 1d f0 26 57 |...[c.........&w|
000001b0 83 ff d9 78 13 02 11 ec bb b4 f4 52 bd 58 5a 7c |...x.......r.xz||
000001c0 fa 43 18 f7 85 8a a1 12 38 ad aa 23 88 7c 62 57 |.c......8..#.|bw|
000001d0 7b 04 99 e4 12 84 88 93 17 26 81 35 ce 7c 2c 1a |{........&.5.|,.|
000001e0 a2 04 2b 1f 47 24 63 d1 d9 82 28 2d 5f 01 fe e1 |..+.g$c...(-_...|
000001f0 17 f2 8b 30 74 1a 8b 50 25 da 74 13 39 5a a9 18 |...0t..p%.t.9z..|
00000200

unknown bootloader on sda2

00000000 66 79 7e fd 03 c3 cd 00 f9 34 56 b8 d5 2d 64 a4 |fy~......4v..-d.|
00000010 f6 51 13 26 ef 4d ba d9 81 bb 8b 3e b0 42 0f 9a |.q.&.m.....>.b..|
00000020 af d7 94 50 63 d8 f1 ca 51 0d 6b 7a 4a a8 af 61 |...pc...q.kzj..a|
00000030 52 0e 84 51 50 fd 2c a8 b8 75 fb 5e 2c c1 73 cb |r..qp.,..u.^,.s.|
00000040 bc cd 31 01 cd 9b 3b a0 01 9f 1b 0d 06 51 a5 32 |..1...;......q.2|
00000050 da 01 6a 4c 01 77 1d e0 0c d8 a3 8a c7 a2 5a 97 |..jl.w........z.|
00000060 45 47 5f 83 34 0b 52 54 67 91 cd b5 ea 22 40 58 |eg_.4.rtg...."@x|
00000070 ec a0 45 c7 0a da b4 8f ef 53 68 b3 e6 8b 1c ce |..e......sh.....|
00000080 5e e8 f0 0e db 13 7c 01 82 25 1a fb 1a 5c d1 22 |^.....|..%...\."|
00000090 cd 8f 55 65 d7 96 28 8b 0b 47 55 b8 61 af d7 1a |..ue..(..gu.a...|
000000a0 47 f4 a4 bc e4 41 da 3d d8 01 7c 60 ae 25 52 d3 |g....a.=..|`.%r.|
000000b0 8e da 44 d3 6f 83 8f 14 b9 26 09 78 90 00 c1 6d |..d.o....&.x...m|
000000c0 c0 2f 95 82 ab 43 0b df ed 91 18 1a 9e 9a aa 36 |./...c.........6|
000000d0 39 ca 1f 9e 02 2e 1d 95 d7 c7 85 60 f6 37 6d f7 |9..........`.7m.|
000000e0 7f de 0a 37 f0 3d 7c 52 78 87 0c f5 1a 7b 25 |...7.=|r.x....{%|
000000f0 2e c6 a8 21 2b 0e 7a d2 74 86 c5 17 36 7e 81 42 |...!+.z.t...6~.b|
00000100 6b 44 19 4a 59 4d 8d 73 0c 11 5a 34 f5 39 20 b4 |kd.jym.s..z4.9 .|
00000110 e6 6a 17 15 ab a3 35 6b 7b 9e 33 59 6b 18 55 71 |.j....5k{.3yk.uq|
00000120 f4 7a 07 4a 26 1b 6c f9 9d 6c 00 f9 bd 76 a5 98 |.z.j&.l..l...v..|
00000130 3e 77 82 31 42 4e b9 91 2b 26 6b cf b7 24 33 83 |>w.1bn..+&k..$3.|
00000140 2a 6d 56 c1 50 de de c8 a4 e5 95 76 00 96 d7 3a |*mv.p......v...
00000150 34 4a 9b c3 d0 0e f6 72 cf 49 c3 35 a9 de e0 b7 |4j.....r.i.5....|
00000160 52 17 4a 18 89 6a 1e bf e6 c4 17 85 79 e9 60 06 |r.j..j......y.`.|
00000170 8d f9 73 11 a0 3a 6f ff 86 0f 78 c5 b9 c6 bc de |..s.....x.....|
00000180 23 d4 b3 bd c0 a4 08 9c 77 2f fe 91 ed e5 28 ab |#.......w/....(.|
00000190 a3 d2 09 c0 f0 c1 fa ad a2 40 15 4b a6 da bf 59 |.........@.k...y|
000001a0 4a 22 20 ab 53 8a 70 80 6f 80 cb c5 e5 32 54 6a |j" .s.p.o....2tj|
000001b0 b7 73 ba 0d ea f8 c6 ac 7e 47 4b 18 14 36 00 3b |.s......~gk..6.;|
000001c0 1d 1f 8e fe ff ff 02 00 00 00 00 40 3b 25 00 00 |...........@;%..|
000001d0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
000001f0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 55 aa |..............u.|
00000200

as can see @ beginning:

grub installed on sda,
try boot on sdb,

fail of course, edit boot line give path. when booted run: sudo grub-mkconfig && sudo update-grub

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