Sim, use o comando subst
na linha de comando: subst NewLetter: OldLetter:\
Por exemplo, para atribuir também a unidade C:
atual à letra H:
: subst H: C:\
Veja subst /?
para mais informações.
Associates a path with a drive letter.
SUBST [drive1: [drive2:]path]
SUBST drive1: /D
drive1: Specifies a virtual drive to which you want to assign a path.
[drive2:]path Specifies a physical drive and path you want to assign to
a virtual drive.
/D Deletes a substituted (virtual) drive.
Type SUBST with no parameters to display a list of current virtual drives.