I installed a new, larger SSD for my data (non-OS) drive "D". Assigned it a temporary drive letter "Z", copied all my files/folders from "D" to "Z", then renamed "D" to "T", and then "Z" to "D" (the new "D").
All my favorites were still highlighted the same way on the new drive but the folder labels for a half-dozen folders stuck to the old drive but weren't on the new. Why? Is there a way around this when swapping/updating drives? TIA!
Assuming the default of Preferences / Labels / Options / Enable label storage in the file system, that should copy the labels over provided Preferences / File Operations / Copying Files / Metadata isn't set to block copying Alternate Data Streams.
(I'm also assuming you did a config backup on the old machine and restored the config on the new one, else the labels assigned to things may not be defined.)
OTOH, if the labels are assigned to paths rather than to the actual files (first option I mentioned is turned off), then they should still be assigned to the same paths (which won't match the backup folder, of course) if the config was restored.
The preferences you list in the 1st paragraph are correctly set.
I did not backup/restore the config. It's the same PC with the same C-Drive. I just added an extra M.2 drive in an open slot and then performed the Disk Management operations I described above. The labels are for folders, not files. But what I see right now is a folder in the T-Drive that still has the label from when it was the D-Drive.
There aren't a lot of these, so it isn't a federal case, I just re-did the 6 folders, but it's weird, no?
What is "They"? I have hidden and system files shown and I don't see any sidecar-like files on the old drive in/around that folder. What would not have been copied?
The ADS (Alternate Data Streams) : they are not sidecar-like files, it's information stored in the filesystem. Whether they get copied or not depends on the second setting Leo mentioned ... and also if the copy "authorized" that copy or not.
Since you have your favorites highlighted, it seems they got copied at least for the favorites, unless the favorites labels were assigned through Opus settings (by path).
"Copy to new file, unless slower" should be sufficient.
The "unless slower" part only matters if Preferences / Miscellaneous / Advanced: [Filesystem] copy_allow_delegation has been changed to False. There's almost never a reason to do that, but if it has been changed then you'd want the "Copy to new file" mode instead.
What happens if you copy a labelled folder now, with the same drive as the destination? Does the label copy as well?
Also, which filesystem is the new drive using? (Right-click the drive and choose Properties to find out.) It has to be NTFS for this to work. If it's FAT32 or exFAT or anything like that, it cannot store the metadata used for labels.