Log in to TARGET, Go to Accounting System > Company Profile > Update Company Profile
Here is the Screen shots step by step
Screen 1 ( Enter Accounting System Menu )
Screen 2 ( Enter Setup Company Profile )
Screen 3 ( Enter Update Company Profile )
Screen 4 ( Chose the company and press enter )
Now chose the Company that you want to know the data directory number and Press ALT + F3
Check the bottom of the screen, It will Show the data directory no i.e DATA01 or DATA02
Here in this screen shot data directory is DATA05 see the line displayed after Income Tax No.
P.S : If your company data have some error and not allowing to log in , than Log in with
some other company and follow the process if you have only one company then contact support.
For any further clarification contact support desk