Software for the opposite of checking for duplicates? (checking each file has a match)

[whitedragon101]

I have an external drive with all my photos on. I copied them all to a second drive and re arranged them into a better folder structure. However, before I delete the original drive and use the new as my master copy I want to make sure every picture in the original drive has a match in the new drive.

Any idea of software to do this?

I need to be very sure as this is literally every picture I have since birth.

Many thanks

ps
(I have tried importing the new drive to lightroom and then bringing up the import dialogue for the original drive, where don't import duplicates is selected. However, I am not entirely sure this method is foolproof so I need another way to double check).

 

[simonsi]

Don't throw away/format or otherwise change the original drive. Keep it as a backup, risking those images to ANY single drive is unwise as it <will> eventually fail.

Just keep the original as a backup copy in addition to any backups you intend to make of the rearranged drive...

 

[robgendreau]

This might work: https://itunes.apple.com/us/app/compare-sync-folders/id1001460601?mt=12

 

[whitedragon101]

Don't throw away/format or otherwise change the original drive. Keep it as a backup, risking those images to ANY single drive is unwise as it <will> eventually fail.

Just keep the original as a backup copy in addition to any backups you intend to make of the rearranged drive...

I have a copy of the original on my NAS as well and a copy of the new one.

My photos were spread out across several drives with so many backups it became confusing. I am trying to consolidate all of them to one definitive version. Then perform a battery of tests to make sure they are all there. Back up the new version a few times (2nd hard drive NAS, iCloud, Amazon Photos, then delete the other drives, so everything is nice and neat. One definitive organised collection backed up many times.
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This might work: https://itunes.apple.com/us/app/compare-sync-folders/id1001460601?mt=12

Thanks just sent them an email to see what they say