I agree, Win32::DriveInfo is best.
As we just discussed here, this code also works:

use File::Find;
use Win32API::File qw( :Func :DRIVE_ );

my @drives = map { tr{\\}{/}s; $_ }
             grep { GetDriveType($_) == DRIVE_FIXED }
             getLogicalDrives();

find( sub {
  $File::Find::prune = 1, return
    if $File::Find::name =~ m{^.:/System Volume Information$};
  print "$_\n";
}, @drives );
[download]

Perhaps someone will find it useful when Win32API::File is at hand, but Win32::DriveInfo is not.