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Cookie File Slack

Posted on 2010-08-19
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Last Modified: 2016-02-21
I'm looking over a case that just came in and I was examining the cookies because the client wanted them looked over.  I noticed that 3 of the files have file slack.  Is this because a bigger file was there and when the current cookie was written to that sector, it was smaller than the previous one?  Also, all the cookies begin in various sector offset's except for one; which begins in sector offst 0.  Any ideas?  I've asked around in my shop and they have no clue, we've googled all day and found nothing.
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Question by:AlwaysDeployed
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9 Comments
 
LVL 84

Accepted Solution

by:
Dave Baldwin earned 750 total points
ID: 33481819
I would expect the slack.  'Session' cookies which are stored only as long as the browser is open should be erased the next time the browser is opened.  There is an index file there somewhere which contains pointers to the cookies.  No particular need to take up the slack every time.
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Assisted Solution

by:LeeKowalkowski
LeeKowalkowski earned 750 total points
ID: 33483146
Doesn't every small file have slack?  Cookies are typically small.  

Internet Explorer doesn't write session cookies to the file system.  They must be persistent cookies.

What specifically about your findings do you consider to be atypical?  What's the OS and File System too?
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Author Comment

by:AlwaysDeployed
ID: 33498396
Out of about 50 cookies 2 of them have file slack and the physical sizes aren't equal to the logical size.  The OS is Win XP NTFS.  I understand that most files have file slack depending on the size of the file but why would only two of the cookies have slack and the rest don't.
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LVL 16

Expert Comment

by:LeeKowalkowski
ID: 33499244
Indeed, it's the ones that don't that I'd be more interested in.  What's the physical size? 1KB?  All but two cookies are also logically exactly 1KB?  That doesn't seem likely.
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Author Comment

by:AlwaysDeployed
ID: 33539083
The physical size of one is 50kb and the other is 4,096kb.  The rest of the cookies on the drive are the same physical and logical size except for these two.  
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LVL 84

Expert Comment

by:Dave Baldwin
ID: 33539444
When I look at Properties for cookies, the sizes vary from 61 bytes to 2.86 Kbytes.  Windows Explorer lists all the small ones as 1K.  50kb is kinda large for a cookie.  I had some at 4k or 5k but I deleted them.
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Author Closing Comment

by:AlwaysDeployed
ID: 33555862
My issue wasn't answered directly but the answers received did give me other ideas and reference points.  I appreciate the help.
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Expert Comment

by:brian oldeard
ID: 41474836
I have the same problem with cookies... I can't explain that some of the cookies have slack and the rest don't? And cookies begin in various sector offset? I have windows 7 with NTFS.   Can somebody explain me clearly...

Thank for your help guys,
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LVL 84

Expert Comment

by:Dave Baldwin
ID: 41474950
Lady Amherst, this is an old question.  The only reason I know that you posted is because I answered it 5 years ago.  Please open a new question so that other people will see it and respond.
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