In some cases involving the Apple Double format, moving a file to a different file system will cause the prefix "._" to appear on a file name.

Symptom

The prefix "._" appears on a file name.

Products affected



  • Mac OS X 10.0 and later

Solution

Before Mac OS X, the Mac OS used 'forked' files, which have two components: a data fork and a resource fork. The Mac OS Standard (HFS) and Mac OS Extended (HFS Plus) disk formats support forked files. When you move these types of files to other disk formats, the resource fork can be lost.

With Mac OS X, there is a mechanism called "Apple Double" that allows the system to work with disk formats that do not have a forked file feature, such as remote NFS, SMB, WebDAV directories, or local UFS volumes. Apple Double does this by converting the file into two separate files. The first new file keeps the original name and contains the data fork of the original file. The second new file has the name of the original file prefixed by a "._ " and contains the resource fork of the original file. If you see both files, the ._ file can be safely ignored. Sometimes when deleting a file, the ._ component will not be deleted. If this occurs you can safely delete the ._ file.


위 글을 요약하자면,  '._filename' 형태의 파일이 생기는 원인이 afpd 방식의 연결이 아닌 smb, cifs 방식의 연결로 인해 생긴다는 내용.
Mac OS X에서 cifs 방식으로 파일서버에 연결하면 '._filename' 형태로 파일이 생기며, 이 파일은 썸네일 정보를 포함한다. 하지만 클래식 OS에선 썸네일이 보이지 않는다.

Mac OS X: Apple Double Format Creates File Name With the Prefix '._'

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