[Grml] Writing to Hard Drives from LiveCD

[Juergen Fiedler]

I have observed something odd: When I write data to a mounted hard drive partition while running from the livecd, the amount of written data is subtracted from the free RAM, i.e., if I do a
 
  dd if=/dev/zero of=/mnt/hda1/tmp/testfile bs=1M count=512

with /dev/hda1 mounted on /mnt/hda1, I am losing 512M of my RAM; deleting the file frees up that RAM.
After rebooting, the file is still there, but doesn't take up any RAM anymore.

I think I may be missing something vitally important about how the unionfs is set up. Can anybody please tell me how I can write files to an HD without them taking up RAM, too?

Any help would be much appreciated!
Cheers,
 --j

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