No Disk error & MountedDisks

[FlexibleLearning at aol.com]

When testing for file and/or directory existence, has anyone figured a way  
to avoid the 'No disk' system error mesage in Windows?
 
'Catch' does not trap system errors...
 
try
 get (there is a file tPath) # Poof!
catch errorNum
 get false
end try
return it
 
   
Alternatively, has anyone got a 'MountedDisks' function for Windows that  
would return the equivalent list as 'the volumes' on a Mac?
 
if (cr& char 1 to 2 of tFilePath) is in cr& mountedDisks() then  ...
 
Very annoying!
 

/H