The default value is 1, unless you set the handleHardIOErrors program property to NO, which sets the variable to 0. (That property is also available for other main logic parts.) For more information, see Exception handling.
You cannot use vgVar.handleHardIOErrors as the target of a move statement.
The following example shows the vgVar.handleHardIOErrors variable:
vgVar.handleHardIOErrors = 1;