On 6/13/19 8:25 AM, J. P. Gilliver (John) wrote:
In message , Ken Springer
writes:
On 6/11/19 12:01 PM, Miker wrote:
Looking for a way to see if files are missing on a flash drive as
compared to my hard disk folder and then be able to copy to synchronize.
Any good free applications for that ?
Would be nice if it worked on Windows XP but not mandatory.

(See my previous post recommending SyncToy.)

OK... Here's a question for you...

Are you 100% sure the *contents* of two or more files with the same
name are identical? If you are, then there's no reason for you or
anyone to read any further.

You are answering - or rather, not answering - a question that "Miker"
didn't ask. I may be wrong, but I think what he is wanting to do is
verify that he has a true copy (of "my hard disk folder") on his flash
drive, and amend if not. I would think he wants, if he had duplicates in
different sub-folders on the source (drive, partition, folder,
whatever), he wants to end up with the same duplicates in the copy.

True, Miker didn't ask. But I wondered if it was something that had
occurred to him or not. In case the thought didn't occur, I thought it
might prove helpful to keep from making any mistakes.

But if one or more file, with the same filename exists at each location,
is it really a "true copy"? I would say no.

I agree with what you think he wants, I would just hate to see Miker
toss something out that he really wants solely because the filename is
the same.

Now, on your other subject:

My brother-in-law takes more photos than most people do. He used to
reload bulk film into empty film cartridges.

(I did that. Reverse-processing, so I took monochrome slides.)
[]
And now, he wants to get rid of all the duplicates! He's having to
open them all to see which ones he wants to keep.

Rather daunting, wouldn't you say? G

Yes! However, there _are_ several softwares specifically designed for
that purpose. The better ones will bring up two candidates side-by-side
(and show parameter information where available, such as size [pixels
_and_ filesize], full pathname, and date and/or other information where
available), for you to decide which to keep (letting you open them in
your preferred software to look more closely), and:

o let you set a percentage match before they show you the "matches"
o compare images of different resolutions and filetypes
o detect rotations, at least multiples of 90 degrees


Without the details, that's exactly what I told him. But I don't know
if he looked, or asked anyone to look. :-(

snip

--
Ken
MacOS 10.14.5
Firefox 67.0
Thunderbird 60.7
"My brain is like lightning, a quick flash
and it's gone!"