Library module Folder names can not include '@' when files are on an external drive?

[kenwood]

Lightroom Version Number

13.2

Operating System

1. Windows 10

I came across a strange behavior when renaming folders inside lightroom. I have a LR catalog on an external drive, and when I try to rename some of the folders to include the '@' symbol, the 'missing folder' icon shows up. I tried to manually point it to the new folder by doing right click and select 'find missing folder', but it did not help. I end up renaming the folder on windows explorer to remove '@' symbol in order for things to get back to normal. When I perform the same renaming operation on a LR catalog sitting inside a computer everything works as expected. The only difference between the two operation is that the first catalog along with files are on an external drive, and the second catalog along with files are on a laptop hard drive.

 

[clee01l]

What are the valid file names in Windows?
Supported File Types and Valid File Names - Sfax
Supported characters for a file name are letters, numbers, spaces, and ( ) _ - , . *. Please note file names should be limited to 100 characters. Characters that are NOT supported include, but are not limited to: @ $ % & \ / : * ? " ' < > | ~ ` # ^ + = { } [ ] ; !

For Mac here's the simple rule that will ensure your filenames will work everywhere: Name files only with uppercase (A-Z) and lowercase (a-z) letters, digits (0-9), and the hyphen (-) and underscore (_), plus a single period (.) and extension.Jun

Adobe has written the app for both windows and Mac and need to follow rules for both OS Additionally, searches involve the data base and the language to query the database is SQL and it also has special rules which prohibit special characters in the query search parameters.


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[Hal P Anderson]

Supported File Types and Valid File Names - Sfax

I don't know what sfax has to do with anything, but @ is perfectly valid in a folder name in Windows 10:

The OP says it doesn't work with LRC on an external disk, but it does on the internal disk.
How is that external disk formatted? Is it a NAS?

 

[clee01l]

I don't know what sfax has to do with anything, but @ is perfectly valid in a folder name in Windows 10:
View attachment 22981
The OP says it doesn't work with LRC on an external disk, but it does on the internal disk.
How is that external disk formatted? Is it a NAS?

SFAX + https://sfax.scrypt.com/article/144...=Supported characters for a file,= { } [ ] ; !

Here is another reference: Note it says "Avoid" rather than "Not Supported" https://resources.ascented.com/ascent-blog/tips-file-and-folder-naming-convention

Use letters (A-Z) and numbers (0-9). Avoid special characters.

For the filename, use only alphanumeric characters and avoid special characters (such as ! # $ % & ' @ ^ ` ~ + , . ; =) that may cause errors.

UNIX naming rules can come into play if the files are on a NAS.

SQL makes extensive use of special characters. Note this comment about MySQL and the "@" symbol:
When defining variables in MySQL, they may be prefixed with @ or @@. A single @ lets a user-defined variable persist beyond the query that defined the variables, and @@ is a reference to global state, such as @@global.port.

Symbol	Operation
@	User session variable
@@	System variable

Oracle uses @ for running scripts. You can check out more here.

 

[kenwood]

To be clear, on both the external and internal HD, the folder was renamed successfully with the '@' symbol as part of its name, but the LR catalog can not read this folder from the external HD, but able to from the internal one. Which is why I believe its a LR issue not a file system nor OS one.