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open(BB, $ARGV[0]) || die "open $ARGV[0]: $!";
binmode BB;
my $buf;
read(BB, $buf, 1000);
$n = length($buf);
if($n > 510){
print STDERR "boot block too large: $n bytes (max 510)\n";
exit 1;
print STDERR "boot block is $n bytes (max 510)\n";
$buf .= "\0" x (510-$n);
$buf .= "\x55\xAA";
open(BB, ">$ARGV[0]") || die "open >$ARGV[0]: $!";
binmode BB;
print BB $buf;
close BB;
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