And rest of data that doesn’t fall into any of the remaining OS X categories.Cache files such as system cache, user cache, browser cache.Document files like PDF, PSD, DOC, etc.Other storage categories on the Mac system holds files which do not fall into any other category like Audio, Apps, Photos, Movies, and Backups. If you are facing low disk space problem on your Mac machine, then it’s worth to know what is Other storage and how to deal with it. Other storage on Mac is not something to bother much unless you are running low on Mac disk space. You might wonder what is this Other on my Mac storage? When you look at the Storage of your Mac machine, you will see a huge Other storage occupying more space on your Mac hard disk.