Tests for the existence of a drive.
DiskExist(driveletter)
(s) driveletter drive being tested.
(i) @TRUE if the drive was found; @FALSE if the drive was not found.
Use this function to test for the existence of a specific disk drive.
b="A:" a=DiskExist(b) If a Message("Disk Exists", b) Else Message("Disk Does Not Exist", b) EndIf