Re: [Bug-ddrescue] address@hidden (How to save mapfile when it is not specified)

[David Morrison]

At 4:00 +0300 15/2/19, äÓÒÚËÌ ÑÏËڕËÈ wrote:
> ----- Original Message -----
> From: "David Morrison" <address@hidden>
>
> >  I wonder if putting it to sleep would help, as that saves a copy of
> >  memory for the restore?
>
> Surely, hibernated system saves all the memory in a file.
> That was very useful in Windows 3.10 to unprotect some programs,
> originally packed and protected from debuggers. Memory dumps
> were perfect to analyze!
> I think, that feature can help you, too.
> At least, it is much more useful, than nothing we get if the system
> is just shut down.

Normal sleep on a non-battery machine keeps power 
to the RAM. However, you can change the power 
settings to make it save to a file. It is 
explained here:

https://discussions.apple.com/thread/6703375

Of course the question is what happens to the 
sleepimage file after you wake the computer from 
sleep? Does it get modified, or does it stay the 
same as when it went to sleep? (I know it does 
not get deleted.)

The there is the question of whether the mapfile 
data is stored as text or in binary? I imagine it 
is binary which may make it a bit difficult to 
identify which part of the 8GB memory dump it is 
in. And also, it is needed to be in text form for 
ddrescue to use it.