[lug] disk image with dd
Gary.Hodges at noaa.gov
Mon Jul 13 12:57:36 MDT 2009
That's the ticket. Off and running!
> I believe the syntax is slightly different than dd. -- man dd_rhelp for
> more info, but I believe what you want is
> dd_rhelp /dev/hdc /dev/hdd
> Gary Hodges wrote:
>> I must be doing something wrong...
>> >./dd_rhelp if=/dev/hdc of=/dev/hdd
>> Results in:
>> dd_rhelp: error: Please specify a usable file as first argument.
>> The following drives are seen during boot:
>> hda: IBM-DHEA-36480, ATA DISK drive
>> hdb: ST340014A, ATA DISK drive
>> hdc: ST3250824A, ATA DISK drive
>> hdd: WDC WD2500PB-55FBA0, ATA DISK drive
>> hdc is the disk I want to copy from. hdd is the disk that I want to
>> copy to.
>> >fdisk /dev/hdc
>> Command (m for help): p
>> Disk /dev/hdc: 250.0 GB, 250059350016 bytes
>> 255 heads, 63 sectors/track, 30401 cylinders
>> Units = cylinders of 16065 * 512 = 8225280 bytes
>> Device Boot Start End Blocks Id System
>> /dev/hdc1 * 1 5099 40957686 7 HPFS/NTFS
>> /dev/hdc2 5100 30401 203238315 7 HPFS/NTFS
>> Ben wrote:
>>> If you have any errors on the hard drive, dd will just stop. I'm a big
>>> fan on dd_rhelp (I think it is just a wrapper to ddrescue which is a
>>> wrapper to dd) as it jumps over bad regions (fills them with 0's) and
>>> comes back and figures out of the size of the bad region smartly. You
>>> can start/stop it many times and it picks up where it was left off.
>>> Basically it spends its time getting the 'easy' data and then
>>> progressively works harder on the data near bad regions. But otherwise,
>>> you are right about the mount command and making a disk image.
>>> Gary Hodges wrote:
>>>> Hi. I have a drive from a Windows machine (NTFS) that I think may have
>>>> some problems. I'd like to make a copy to play with so I can leave the
>>>> original undisturbed for now. Is this what I should do?
>>>> dd if=/dev/hdx of=/dev/hdy # where x=original, y=copy
>>>> Along those lines, if I did the following
>>>> dd if=/dev/hdx of=/path/to/image
>>>> would I be able to mount the image with something like?
>>>> mount -o loop /path/to/image /mnt/mountpoint
More information about the LUG