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From: John John - MVP on 22 Nov 2009 21:22
???

Real duplicate file finders will find duplicate files by contents, even
if the name and creation dates are different, it would be pretty useless
to search for duplicate by filename only! Real duplicate finders have
options to allow you to select if you want to have the filename or
creation date included in the duplicate file criteria.

John

sgopus wrote:
> Duplicate files are not compared as to content, they are compared to with
> file name. It would be way IBM too complicated to compare the content to find
> duplicate files.
>
> "John" wrote:
>
>> did before coming here...there are a number of them..can't figure which one
>> has the features I need..even installed and tried some as well..thought
>> someone may have a recommendation
>>
>> regards
>>
>> "Pegasus [MVP]" <news(a)microsoft.com> wrote in message
>> news:ebFoI$7aKHA.2680(a)TK2MSFTNGP04.phx.gbl...
>>> "John" <info(a)nospam.infovis.co.uk> wrote in message
>>> news:e6tv247aKHA.5472(a)TK2MSFTNGP02.phx.gbl...
>>>> Hi
>>>>
>>>> Is there a good utility to detect duplicate files based on content and
>>>> then to remove them?
>>>>
>>>> Thanks
>>>>
>>>> Regards
>>> Google is your friend. Type the following words into a Google search box,
>>> then take your pick:
>>>
>>> Windows duplicate file finder
>>>
>>
>> .
>>
From: ED on 22 Nov 2009 21:22
Not true.
Files are compared using the checksum value.
If CRC are equal, file contents must be equal/


"sgopus" <sgopus(a)discussions.microsoft.com> wrote in message
news:0F69381B-5E11-4F93-A5AA-18E2452982A4(a)microsoft.com...
> Duplicate files are not compared as to content, they are compared to with
> file name. It would be way IBM too complicated to compare the content to
> find
> duplicate files.
>
> "John" wrote:
>
>> did before coming here...there are a number of them..can't figure which
>> one
>> has the features I need..even installed and tried some as well..thought
>> someone may have a recommendation
>>
>> regards
>>
>> "Pegasus [MVP]" <news(a)microsoft.com> wrote in message
>> news:ebFoI$7aKHA.2680(a)TK2MSFTNGP04.phx.gbl...
>> >
>> > "John" <info(a)nospam.infovis.co.uk> wrote in message
>> > news:e6tv247aKHA.5472(a)TK2MSFTNGP02.phx.gbl...
>> >> Hi
>> >>
>> >> Is there a good utility to detect duplicate files based on content and
>> >> then to remove them?
>> >>
>> >> Thanks
>> >>
>> >> Regards
>> >
>> > Google is your friend. Type the following words into a Google search
>> > box,
>> > then take your pick:
>> >
>> > Windows duplicate file finder
>> >
>>
>>
>> .
>>


From: sgopus on 23 Nov 2009 17:48
Thanks, I'm updated with that.

"John John - MVP" wrote:

> ???
>
> Real duplicate file finders will find duplicate files by contents, even
> if the name and creation dates are different, it would be pretty useless
> to search for duplicate by filename only! Real duplicate finders have
> options to allow you to select if you want to have the filename or
> creation date included in the duplicate file criteria.
>
> John
>
> sgopus wrote:
> > Duplicate files are not compared as to content, they are compared to with
> > file name. It would be way IBM too complicated to compare the content to find
> > duplicate files.
> >
> > "John" wrote:
> >
> >> did before coming here...there are a number of them..can't figure which one
> >> has the features I need..even installed and tried some as well..thought
> >> someone may have a recommendation
> >>
> >> regards
> >>
> >> "Pegasus [MVP]" <news(a)microsoft.com> wrote in message
> >> news:ebFoI$7aKHA.2680(a)TK2MSFTNGP04.phx.gbl...
> >>> "John" <info(a)nospam.infovis.co.uk> wrote in message
> >>> news:e6tv247aKHA.5472(a)TK2MSFTNGP02.phx.gbl...
> >>>> Hi
> >>>>
> >>>> Is there a good utility to detect duplicate files based on content and
> >>>> then to remove them?
> >>>>
> >>>> Thanks
> >>>>
> >>>> Regards
> >>> Google is your friend. Type the following words into a Google search box,
> >>> then take your pick:
> >>>
> >>> Windows duplicate file finder
> >>>
> >>
> >> .
> >>
> .
>
From: HeyBub on 24 Nov 2009 16:25
ED wrote:
> Not true.
> Files are compared using the checksum value.
> If CRC are equal, file contents must be equal/
>

Almost certainly that's true, but not always.

If the check-sum is four bytes, there's a one-in-four-quadrillion chance the
files could differ but have the same check-sum.


From: Paul Randall on 24 Nov 2009 17:34

"HeyBub" <heybub(a)gmail.com> wrote in message
news:uhiW1yUbKHA.2160(a)TK2MSFTNGP02.phx.gbl...
> ED wrote:
>> Not true.
>> Files are compared using the checksum value.
>> If CRC are equal, file contents must be equal/
>>
>
> Almost certainly that's true, but not always.
>
> If the check-sum is four bytes, there's a one-in-four-quadrillion chance
> the files could differ but have the same check-sum.

Also, a malicious person could have modified the file in such a way that the
CRC is the same as it was before the modification. Other checksum
mechanism, such as MD5 were designed to be more difficult to spoof in this
way, but it turned out to be not that much more difficult. To be really
sure that the content of two files is identical, one might verify that the
CRC, MD5, and SHA checksums are all identical for the two files.

-Paul Randall


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