Best way to compare folder contents?

I'm about to do some googling on this, but wanted to ask here first. It's a little question, usually something I don't give much thought too.

Consider the situation: You have a 10GB folder you need to copy from an external drive to an internal drive over USB. After an hour of xxcopying it over, the results read that of the 1,000+ files successfully copied, 38 failed, and you have no logs available to show you what failed.

So, instead of wasting an hour trying to recopy, is there a way you can compare the folders against each other to identify which files they don't have in common?

As in does anyone know an app that accomplishes such a task?

/edit -- Ok, answered my own question:

http://www.scootersoftware.com/moreinfo.php?c=features

I found that to be a good solution, gave me all the info I needed.

Still open to better suggestions though...

Well, you should have logs shouldn't you?:lildevil: I found this, which pretty much sums up what I remember:

Quote:

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create a log file with:

/on:filename.log or /oa:filename.log

The first creates a new log, the second appends to an existing log.
By default, the log file will contain the names of any files which
failed to be copied. You can also fine tune the contents in the log
file with /oD<n>, /oE<n>, /oF<n>, /oI<n>, /oP<n>, /oS<n>, /oX<n>. See
xxcopy /o/help for the details.

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I guess that is a "better suggestion", but only if you are using xxcopy.

The application/utility you have linked to is way more comprehensive and flexible :D

Quote:

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Well, you should have logs shouldn't you?

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Yes! That would be the obvious answer. But hindsight's 20/20...