Check the rights assigned to d:\

>I am experiencing a problem with ASP.NET application where the
>application has failing access to files/folders create with SUBST
>command. I don't think this is an ASP.NET problem but rather something I need to do on the OS level. Here is description of the problem in more details:
>
>I created a folder D: by using DOS command SUBST D: C:\DATA.
>
>There is a physical folder C:\DATA\MYFOLDER.
>
>When I try to access the folder (from ASP.NET app) as C:\DATA\MYFOLDER, all works well.
>
>When I try to access the folder (again, from ASP.NET app) as
>D:\MYFOLDER, the access is denied.
>
>What can I do to get around this problem?
>
>Thank you in advance for any suggestions.