Help in DD utility

NTDEV
1

Hi All,
I have a windows XP machine having 30 disks. I am trying to dump MBR\EBR
of 10th disk on the 27th disk using dd utility.But I am observing strange
behaviour.I observed that while I am able to write MBR upto initial 26
disks,but not on the 27th disk.
I tried following commands:

dd of=\.\physicaldrive27 of=c:\mbr bs= 512 count=1 (also tried
.\Physicaldrive27)

dd of=/dev/sdaa of=c:\mbr bs=512 count=1 (This syntax of using POSIX names
works upto /dev/sda to /dev/sdz)

Please point me where I am wrong.

Warm Regards,
Vinay

2

>

Hi All,
I have a windows XP machine having 30 disks. I am trying to dump
MBR\EBR
of 10th disk on the 27th disk using dd utility.But I am observing
strange
behaviour.I observed that while I am able to write MBR upto initial 26
disks,but not on the 27th disk.
I tried following commands:

dd of=\.\physicaldrive27 of=c:\mbr bs= 512 count=1 (also tried
.\Physicaldrive27)

dd of=/dev/sdaa of=c:\mbr bs=512 count=1 (This syntax of using POSIX
names
works upto /dev/sda to /dev/sdz)

Please point me where I am wrong.

I’m sure it’s no coincidence that there are 26 letters in the alphabet
and that drive 27 is failing. Maybe dd is internally converting to unix
naming somewhere. Is there an internal table somewhere that only goes up
to sdz that you could just fill out some more?

Have you tried diskprobe?

James

3

In previous mail,the syntax of command is wrong.
The syntax of command is:

dd of=\.\physicaldrive27 if=c:\mbr bs= 512 count=1 (also tried
.\Physicaldrive27)

dd of=/dev/sdaa if=c:\mbr bs=512 count=1 (This syntax of using POSIX names
works upto /dev/sda to /dev/sdz)

Regards,
Vinay

On Wed, May 27, 2009 at 10:19 AM, James Harper <
xxxxx@bendigoit.com.au> wrote:

>
> Hi All,
> I have a windows XP machine having 30 disks. I am trying to dump
MBR\EBR
> of 10th disk on the 27th disk using dd utility.But I am observing
strange
> behaviour.I observed that while I am able to write MBR upto initial 26
> disks,but not on the 27th disk.
> I tried following commands:
>
>
> dd of=\.\physicaldrive27 of=c:\mbr bs= 512 count=1 (also tried
> .\Physicaldrive27)
>
> dd of=/dev/sdaa of=c:\mbr bs=512 count=1 (This syntax of using POSIX
names
> works upto /dev/sda to /dev/sdz)
>
>
> Please point me where I am wrong.
>

I’m sure it’s no coincidence that there are 26 letters in the alphabet
and that drive 27 is failing. Maybe dd is internally converting to unix
naming somewhere. Is there an internal table somewhere that only goes up
to sdz that you could just fill out some more?

Have you tried diskprobe?

James

NTDEV is sponsored by OSR

For our schedule of WDF, WDM, debugging and other seminars visit:
http://www.osr.com/seminars

To unsubscribe, visit the List Server section of OSR Online at
http://www.osronline.com/page.cfm?name=ListServer