ppm mkdir error

Hi

Why do I get this error? The D:-drive is a CDROM and there is no need  
to write there.

Thank you for help
Urs

=============
PPM> install C:\DATA\download\rrdtool\RRDs.ppd
Install package 'C:\DATA\download\rrdtool\RRDs.ppd?' (y/N): y
Installing package 'C:\DATA\download\rrdtool\RRDs.ppd'...
mkdir D:\: Permission denied; The device is not ready at  
C:/strawberry/perl/site/lib/PPM.pm line 333
=============

RRD Version:
RRDs-1.2023.tar.gz

C:\>perl -V
Summary of my perl5 (revision 5 version 8 subversion 8) configuration:
   Platform:
     osname=MSWin32, osvers=5.1, archname=MSWin32-x86-multi-thread
     uname=''
     config_args='undef'
--