Be ready though: if you use such a drive on a Mac and then access its files from a PC, you may think you’re seeing your files twice. A file named
file.txt will appear again as
._file.txt. Note the dot-underscore “._” at the beginning: the period “.” and underscore “_” at the start of the file name. That little file contains the Mac system’s reference information about the file.
Those infamous “dot-underscore” files are invisible on the Mac. Any file name that begins with a period (“dot”) is obscured on the Mac’s desktop, but they will show up when you look at the disk containing those files on your PC. You can delete them with no problem, but make sure you know which you’re looking at, and don’t get mixed up.