[gentoo-user] Disk Partitioning

[gentoo-user] Disk Partitioning

[Paul Stear]

Hi all,
I am so dumb.  I partitioned a new disk for 1 large partition, I then needed 
to make a file system and by mistake I entered
mke2fs -j /dev/sda and ignored the warning.  I soon discovered that I didn't 
have any partition so I created it again with fdisk and the made the file 
system correctly with mke2fs -j /dev/sda1

My problem now is that when I plug the disk in (it's am external USB disk) I 
get 2 icons on my kde desktop both saying 200G Media one is /dev/sda and the 
other /dev/sda1 but of course I only have 1 200G disk.

How can I correct this?

Paul
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Re: [gentoo-user] Disk Partitioning

[Hans-Werner Hilse]

Hi,

On Thu, 16 Mar 2006 10:50:10 +0000 Paul Stear <gentoo@appjaws.plus.com>
wrote:

> My problem now is that when I plug the disk in (it's am external USB
> disk) I get 2 icons on my kde desktop both saying 200G Media one
> is /dev/sda and the other /dev/sda1 but of course I only have 1 200G
> disk.

Probably there are still the filesystem magic bytes written in the boot
sector (first 512 bytes). I think overwriting them should do the trick,
but I'd like a second opinion on this, before I advice you to do
"dd if=/dev/zero of=/dev/sda bs=512 count=1" (but if there isn't any
data on that drive, then go and try this...)

-hwh
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Re: [gentoo-user] Disk Partitioning

[Paul Stear]

On Thursday 16 Mar 2006 12:01, Hans-Werner Hilse wrote:
> Hi,
>
> On Thu, 16 Mar 2006 10:50:10 +0000 Paul Stear <gentoo@appjaws.plus.com>
>
> wrote:
> > My problem now is that when I plug the disk in (it's am external USB
> > disk) I get 2 icons on my kde desktop both saying 200G Media one
> > is /dev/sda and the other /dev/sda1 but of course I only have 1 200G
> > disk.
>
> Probably there are still the filesystem magic bytes written in the boot
> sector (first 512 bytes). I think overwriting them should do the trick,
> but I'd like a second opinion on this, before I advice you to do
> "dd if=/dev/zero of=/dev/sda bs=512 count=1" (but if there isn't any
> data on that drive, then go and try this...)
>
> -hwh
Thanks for the reply, I tried your suggestion but it didn't make any 
difference.
This is a print the raw data in the partition table
Device: /dev/sda
0x000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x060: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x070: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x090: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0A0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0B0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0C0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0D0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0E0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0F0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x110: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x120: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x130: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x140: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x150: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x160: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x170: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x190: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x1A0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x1B0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x1C0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x1D0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x1E0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x1F0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 55 AA

This is the same type of disk's print the raw data in the partition table
Device: /dev/sda
0x000: 33 C0 8E D0 BC 00 7C FB 50 07 50 1F FC BE 1B 7C
0x010: BF 1B 06 50 57 B9 E5 01 F3 A4 CB BE BE 07 B1 04
0x020: 38 2C 7C 09 75 15 83 C6 10 E2 F5 CD 18 8B 14 8B
0x030: EE 83 C6 10 49 74 16 38 2C 74 F6 BE 10 07 4E AC
0x040: 3C 00 74 FA BB 07 00 B4 0E CD 10 EB F2 89 46 25
0x050: 96 8A 46 04 B4 06 3C 0E 74 11 B4 0B 3C 0C 74 05
0x060: 3A C4 75 2B 40 C6 46 25 06 75 24 BB AA 55 50 B4
0x070: 41 CD 13 58 72 16 81 FB 55 AA 75 10 F6 C1 01 74
0x080: 0B 8A E0 88 56 24 C7 06 A1 06 EB 1E 88 66 04 BF
0x090: 0A 00 B8 01 02 8B DC 33 C9 83 FF 05 7F 03 8B 4E
0x0A0: 25 03 4E 02 CD 13 72 29 BE 46 07 81 3E FE 7D 55
0x0B0: AA 74 5A 83 EF 05 7F DA 85 F6 75 83 BE 27 07 EB
0x0C0: 8A 98 91 52 99 03 46 08 13 56 0A E8 12 00 5A EB
0x0D0: D5 4F 74 E4 33 C0 CD 13 EB B8 00 00 00 00 00 00
0x0E0: 56 33 F6 56 56 52 50 06 53 51 BE 10 00 56 8B F4
0x0F0: 50 52 B8 00 42 8A 56 24 CD 13 5A 58 8D 64 10 72
0x100: 0A 40 75 01 42 80 C7 02 E2 F7 F8 5E C3 EB 74 49
0x110: 6E 76 61 6C 69 64 20 70 61 72 74 69 74 69 6F 6E
0x120: 20 74 61 62 6C 65 00 45 72 72 6F 72 20 6C 6F 61
0x130: 64 69 6E 67 20 6F 70 65 72 61 74 69 6E 67 20 73
0x140: 79 73 74 65 6D 00 4D 69 73 73 69 6E 67 20 6F 70
0x150: 65 72 61 74 69 6E 67 20 73 79 73 74 65 6D 00 00
0x160: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x170: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x180: 00 00 00 8B FC 1E 57 8B F5 CB 00 00 00 00 00 00
0x190: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x1A0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x1B0: 00 00 00 00 00 00 00 00 58 BB 35 CD 00 00 00 01
0x1C0: 01 00 07 3F E0 FF 20 00 00 00 E0 E7 49 17 00 00
0x1D0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x1E0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x1F0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 55 AA
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Re: [gentoo-user] Disk Partitioning

[Matthias Bethke]

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Hi Paul,
on Thursday, 2006-03-16 at 12:44:15, you wrote:
> > "dd if=/dev/zero of=/dev/sda bs=512 count=1" (but if there isn't any
> > data on that drive, then go and try this...)
> >
> Thanks for the reply, I tried your suggestion but it didn't make any 
> difference.

If there's nothing on it yet, you can of course zero-out the whole
disk---bit of an overkill but will do the job :) I would have thought
killing the boot sector would do it as well but then perhaps the volume
manager could be looking for a root sector?

cheers!
  Matthias
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Re: [gentoo-user] Disk Partitioning

[Rick van Hattem]

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On Thursday 16 March 2006 18:55, Matthias Bethke wrote:
> Hi Paul,
>
> on Thursday, 2006-03-16 at 12:44:15, you wrote:
> > > "dd if=/dev/zero of=/dev/sda bs=512 count=1" (but if there isn't any
> > > data on that drive, then go and try this...)
> >
> > Thanks for the reply, I tried your suggestion but it didn't make any
> > difference.
>
> If there's nothing on it yet, you can of course zero-out the whole
> disk---bit of an overkill but will do the job :) I would have thought
> killing the boot sector would do it as well but then perhaps the volume
> manager could be looking for a root sector?
>
> cheers!
>   Matthias
Normally it wouldn't

Problems like this can usually be solved by
1. wiping the first few sectors on the harddisk (I usually do "dd if=/dev/zero 
of=/dev/sda bs=1k count=100", I know it's way more then neede but it never 
hurts and types just as fast ;))
2. (s/c)fdisk the drive and create the new partition and reboot after it to be 
certain the partition table is read again (I've seen otherwise before)
3. mke2fs, mkreiserfs, or something similar :)

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Re: [gentoo-user] Disk Partitioning

[Paul Stear]

On Thursday 16 Mar 2006 18:58, Rick van Hattem wrote:
> dd if=/dev/zero
> of=/dev/sda bs=1k count=100
Thanks for the help
That worked It is now only showing sda1
Paul
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