When working with binary files, Perl can easily read just the first 512 bytes of a 5gb iso file. JavaScript cannot do that. It would try to read the entire file first, and there's nothing you can do to go around that. lol

#!/usr/bin/node
"use strict";
/* perl -wMstrict -le 'open my $fh, "<:raw", "5gig.iso" or die $!;
        seek($fh,0x8000,0) or die $!; read($fh,my $buf,512)==512
        or die; print unpack("H*",$buf)' */
// https://nodejs.org/docs/latest-v12.x/api/fs.html
const fs = require('fs');
fs.open( '5gig.iso', 'r', function (err, fd) {
        if (err) throw err;
        var buf = Buffer.alloc(512);
        fs.read(fd, buf, 0, buf.length, 0x8000,
            function (err, bytesRead, buffer) {
                if (err) throw err;
                if (bytesRead!=buf.length)
                    throw "not enough bytes read!";
                console.log(buffer.toString('hex'));
            });
    } );
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