I get no such popup.
Who built your Perl? What version is it? (I used ActivePerl v5.14.0.) I think there's a system call that configures the behaviour. (I can't remember what it's called.) There could be differences between our builds in how it's called.
Why kind of drive causes the popup? (I have a CD drive but no diskette drive.)
By the way, ever hear of loops? They are used to avoid having long lists of nearly identical code.
Update: Forgot to address your actual goal!
my objective here is to get the drive which my perl script lies in
use Path::Class qw( file );
my $vol = file($0)->absolute()->volume();
$vol = "$1:" if $vol =~ /^(?:\\\\\?\\)?([a-zA-Z])\z/;
$vol = uc($vol) if $vol =~ /^[a-zA-Z]:\z/;
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