[lug] disk image with dd

[Gary Hodges]

That's the ticket.  Off and running!

Ben wrote:
> 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
> 
> 
> Ben
> 
> 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