Advice on file saving

Never had this clear in my mind:
When a file that already exists is saved with updated contents.
does the file that exists need to be killed
 or
is it completely overridden and the old contents no longer exist ?
isnoend2001Asked:
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JohnBusiness Consultant (Owner)Commented:
Within Windows, a new file saved over top of the old file (Replace) kills the contents of the old file and leaves only the new file.

(I suppose some expert with specialized disk tools might get some old content, but I do not think that is what you are asking)
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isnoend2001Author Commented:
Thanks, thats what i thought, but was never completely sure
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JohnBusiness Consultant (Owner)Commented:
@isnoend2001  - You are very welcome and I was happy to help.
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