Re: [Bug-ddrescue] Handling drives that have broken partition table?

[Narcis Garcia]

You are asking for a low level cache (editable cache), and it could be
much interesting for sector 0 problems and other situations.

I don't know if deploying a RAID1 simulation could make Linux to read
bad sectors from mirror device.



On 07/02/16 04:15, Paul Daniels wrote:
> Sorry, I should have been more specific about the particular situation
> that arises.
> 
> When sector-0/partition-table is physically damaged and non-recoverable
> it sometimes causes the drive to "offline" itself when you try to read
> it, as such you can never recover these drives with ddrescue+linux
> because linux will attempt to read that partition table each time you
> power the drive up.
> 
> What would be nice is if there was an overlay facility/magic in linux
> where, if you already had a copy of the data in that area (or even just
> fake), you could make linux read the partition/data from the image/clone
> and switch to the real drive for other areas.
> 
> Hope that clears matters up.
> 
> 
> On 07/02/16 03:09, Narcis Garcia wrote:
>> Partition table and drive presence are 2 unrelated things.
>> Partition table is data, and drive is a device.
>> Sector 0 should be copiable without any MBR/GPT/etc data in it.
>>
>>
>> On 06/02/16 14:08, Cameron Andrews wrote:
>>> That doesn't work though if Linux says "nope, there is no drive here"
>>> when it cannot find the partition table..  ie: the /dev/sdX is not
>>> present for the drive because no table was readable...
>>>
>>> On 06/02/16 03:31, Antonio Diaz Diaz wrote:
>>>> Narcis Garcia wrote:
>>>>> Number of disk sectors could be specified to ddrescue?
>>>> Sure:
>>>>    ddrescue --size=123456s
>>>>
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