Image of same folder different checksum, is this right?

I recognize that this is not specifically a mac only issue, but since I am using terminal and disk utility to perform this quest, I figured it cannot hurt to ask here.
I was exploring the use of checksum with certain media. Through trial and error, I realized that I can have the identical checksum of an md5 and sha1 of a file, reguardless of it being created at different times or having different names. The only thing that mattered was that the content inside was exactly the same. For this I created a txt file with the word "hello" in it then checking it, making another with the word hello in it, and then making dozens of different types of DMG, CDR, and ISO files all mounting and checking to make sure that the checksum of the FILE was the same. So it was, i feel good about that, means it is working, however, this is where it gets strange.
I made a bunch of DMG files in exactly the same mannor of exactly the same, unchanged folder containing the txt file, yet everytime i made a new one the checksum was different. And strangely enough, even after creating the identical file in the same location (deleting/renaming the first), it would hav edifferent checksum as well as different sizes reported in info. Am I wrong to assume that a dmg of the same file should have the same checksum. It is possible that because everytime you make a dmg of a file it has different sizes, it is possible that for that very strage happening, logically the checksum would be different.
Final question, should taking a DMG, and converting it to an ISO or CDR, then back to a DMG make it so it has the same checksum as the origional?

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Problem in Saving Images in Single Folder in Nokia...

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Solved!
Go to Solution.

Hey bro thanks for reply..My main purpose for asking this question was related to xplore only. I tried xplore on my E63. When we hide folder by xplore, we browse through file manager.I mean xplore shows Folders that are in File Manager.After Hiding folder, when I go to Gallery->Images, all the images in folder which I have made hiden, are visible,but...but....all the images are converted in one images. Let me explain, Suppose my folder contains 15 images named IM1,IM2,IM3....IM15. ok. After hiding folder in gallery when i See, there are total 15 images but all are IM1.Again when I unhide folder, its normal. I also tried ticking system option along with hide option in Attributes of xplore as someone suggested me to do so.But didn't worked. My main purpose for asking to move all images into single folder was this only.I didn,t knew you too would be using xplore or else i would have directly asked you this question only.
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Message Edited by ved123 on 06-Aug-2009 11:52 AM

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evolution wrote in message news:<[email protected]>...
> How can I save my data and the date,the time into the same file when
> I run this VI at different times?
>
> I use a translation stage for the experiment.For each user in the lab
> the stage position (to start an experiment) is different.I defined one
> end of the stage as zero. I want to save the position , date and time
> of the stage with respect to zero.I want all these in one file, nd
> everytime I run it it should save to the same file, like this:
> 2/12/03 16:04 13567
> 2/13/03 10:15 35678
>
> So I will track the position from day to day.If naybody helps, I
> appreciate it.Thanks.
Hi,
I know the function "write to spreadsheet file.vi"
can append the data
to file. You can use the "concatenate strings" to display the date,
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Regards,
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Image of same folder different checksum, is this right?

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