PC1 & PC2 are both running Windows 7 Professional. 64-bit & 32-bit respectively.

PC1 contains a secondary internal HDD, as D:\

PC1 also has an external HDD as E:\

D & E are shared on PC1.

On PC2, I can map to `\\PC1\E`, using the credentials of PC1's admin user.

On PC2, if I attempt to map to `\\PC1\D`, using the credentials of PC1's admin user, I receive an error:

> 
> The network folder specified is currently mapped using a different
>  user name and password.
> 
> 
> To connect using a different user name and password, first disconnect
>  any existing mappings to this network share.
> 
> 
> 

If I open cmd and run net use, I see that `\\PC1\E` is mapped, but `\\PC1\D` is not mentioned.

Why can't I map to `\\PC1\D` on PC2? Thanks.