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Old 07-31-2009, 03:14 AM   #1
Usmanaj
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Registered: Mar 2007
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Difference in the RAM's size and the size of the image of RAM (taken via dd), Why?


Greetings all,

I have a RAM of size 1GB. I took an image of it with the help of dd command but the size of image turned out to be 880MB. Why is there a difference? Shouldn't the image size also be 1024MB?

i used following command
Code:
dd if=/dev/mem of=/home/usman/image.dump
Thanks a lot

--
Usman Ajmal
Pakistan
 
Old 07-31-2009, 05:22 AM   #2
ronlau9
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Registered: Dec 2007
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Distribution: Mandriva 2009 X86_64 suse 11.3 X86_64 Centos X86_64 Debian X86_64 Linux MInt 86_64 OS X
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Quote:
Originally Posted by Usmanaj View Post
Greetings all,

I have a RAM of size 1GB. I took an image of it with the help of dd command but the size of image turned out to be 880MB. Why is there a difference? Shouldn't the image size also be 1024MB?

i used following command
Code:
dd if=/dev/mem of=/home/usman/image.dump
Thanks a lot

--
Usman Ajmal
Pakistan
If you look in you're BIOS does it mentioned how much RAM is FREE
Mostly the system also use some RAM and that amount is not seen by the OS
How much RAM is used by the system depends on you're MOBO , graphic card and so on
 
Old 08-01-2009, 12:17 AM   #3
Usmanaj
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Registered: Mar 2007
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I checked the BIOS setting once my machine boots up but i could not find any information regarding how much space of main memory is being used by my system. Figuring out now how to get this info.

Thanks for the reply though.
 
  


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