Your PrimeStone data directory stores your blockchain, configuration, wallet, and masternode data. By default, they are located in the following locations for each OS type:
Windows
Go to Start > Run > %APPDATA%\PrimeStone
(or just enter the above path in explorer)
or C:\Users\%username%\AppData\Roaming\PrimeStone
(Hidden folder "AppData" - How to view hidden folders on Windows)
OSX (MacOS)
Open a finder window, then select the "Go" dropdown menu. In this menu please press the "Go to Folder..." option. In the window that opens type: ~/Library/Application Support/PrimeStone and press enter. If the folder cannot be found please repeat the steps and enter: ~/.primestone
~/Library/Application\ Support/PrimeStone
(/Users/YourUserName/Library/Application\ Support/PrimeStone)
(How to view the hidden folder on OSX)
MacOS High Sierra Only
~/.primestone
(/Users/YourUserName/.primestone)
(How to view the hidden folder on OSX)
Linux
~/.primestone
(Hidden folder ".primestone" - control+h to display in the GUI, ls -a to display in terminal)