When a temporary file folder is specified by the environment variable BSORT_TMPDIR or tmpdir operand (-option option in bsortex command), note the following points.
Specify the existing drive and existing folder.
When specifying a temporary folder, specify its name with the backslash (\) at the end of it. Specification without backslash (\) will cause trouble.
When specifying two or more folders, specify them without putting any blanks.
Example
Correct specification
C:\;D:\
Wrong specification
C:\ ; D:\
Specify folder with enough empty space.
