having issue batch file to delete files and folders of a specified location

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batch

Hi have written a batch file to delete files and folders of a specified location
all is fine but the issue is that when there is no such F: drive in the machine then
the batch file delete the content of the folder where it has been kept .
Can any one help to modify the batch file and to write a condition to check wether that drive is present or not

My batch file

set folder="F:\PortalViewState"
cd /d %folder%
for /F "delims=" %%i in ('dir /b') do (rmdir "%%i" /s/q || del "%%i" /s/q)