What you would want to do, then, is use each one in a loop, rather than getting them ahead of time. That is, rather than: 

my @drives = (
  Win32::GetNextAvailDrive(),
  Win32::GetNextAvailDrive(),
  Win32::GetNextAvailDrive(),
  Win32::GetNextAvailDrive(),
);
do_stuff_with(@drives);

[download]
do this: 
for (1..4)
{
  my $drive = Win32::GetNextAvailDrive();
  do_stuff_with($drive);
}

[download]
Hopefully, do_stuff_with() will net use or something so that the drive becomes unavailable (in use) so the next time through, Win32::GetNextAvailDrive will get a new drive.

In reply to Re^3: randomly choosing an alphabetic letter by Tanktalus
in thread randomly choosing an alphabetic letter by Anonymous Monk

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