UserUnknownFactor

Discovering Hard Disk Physical Geometry through Microbenchmarking

By Henry, on September 6th, 2019

Modern hard drives store an incredible amount of data in a small space, and are still the default choice for high-capacity (though not highest-performance) storage. While hard drives have been around since the 1950s, the current 3.5″ form factor (actually 4″ wide) appeared in the early 1980s. Since then, the capacity of a 3.5″ drive has increased by about 106 times (from 10 MB to about 10 TB), sequential throughput by about 103 times, and access times by about 101 times. Although the basic concept of spinning magnetic disks accessed by a movable stack of disk heads has not changed, hard drives have become much more complex to enable the increased density and performance. Early drives had tens of thousands of sectors arranged in hundreds of concentric tracks (sparse enough for a stepper motor to accurately position the disk head), while current d

	from sys import argv
	import json, re
	from ctypes import c_uint32
	from tqdm import tqdm

	# For usage with KaitaiStruct visualisers
	# (like https://userunknownfactor.github.io/ for example)

	extract_class = "ClassName"

	@powershell.exe -ExecutionPolicy Bypass -Command "$_=((Get-Content \"%~f0\") -join \"`n\");$script=$_.Substring($_.IndexOf(\"goto :\"+\"EOF\")+9); &([ScriptBlock]::Create($script)) %*"
	@goto :EOF

	# PowerShell script starts here, we can also pass parameters like this since they are passed to the script block
	param($parameter1, $parameter2, $parameter3)

	$fileName = "game.exe" // game file
	$fileHashString = "abcdef12345678901111111111111111" // the file's MD5 hash

	function To-Utf16 {

	import win32evtlog # requires pywin32 preinstalled: pip install pywin32
	import os, sys, platform, tempfile, subprocess, base64, hashlib
	from struct import unpack
	import ctypes
	from ctypes.wintypes import HANDLE
	from ctypes.wintypes import BOOL
	from ctypes.wintypes import HWND
	from ctypes.wintypes import DWORD
	from ctypes.wintypes import ULONG
	from ctypes.wintypes import USHORT

	import os, sys
	from glob import iglob

	work_dir = os.getcwd()
	file_list = (
	[f for f in iglob(os.path.join(work_dir, '*/.ks'), recursive=True) if os.path.isfile(f)] +
	[f for f in iglob(os.path.join(work_dir, '*/.tjs'), recursive=True) if os.path.isfile(f)]
	)

	all_codecs = ['utf_16', 'utf_8_sig', 'ascii', 'cp932', 'utf_8', 'shift_jis', 'shift_jis_2004', 'shift_jisx0213']

	import io, os, argparse, sys, textwrap, re, enum
	from struct import unpack, pack

	# NOTE: Repacking mode adds file to the end of the previous archive if it's
	# larger than old or replaces old one if less.
	# WARNING: It MODIFIES ORIGINAL FILE on repack so BACKUP it BEFORE REPACKING!!!

	class EndianBinaryReader:
	endian: str
	Length: int

	// ==UserScript==
	// @name Furiganizer
	// @description Romanize hiragana/katakana in selected sites
	// @match https://ja.wikipedia.org/*
	// @version v1
	// @grant none
	// @run-at document-body
	// ==/UserScript==

	(function() {

	#!/usr/bin/env python
	# coding: utf-8

	#####################################################################
	# Python XOR 2 Files (xor.py)
	# Use: xor.py file1 file2 [outputFile]
	# Example: xor.py a.txt b.txt C:\result.txt
	#####################################################################

	import sys, os, re

	Windows Registry Editor Version 5.00

	[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\ImmersiveShell\EdgeUI]
	"DisableCharmsHint"=dword:00000001
	"DisableTRCorner"=dword:00000001

	import os, sys
	from glob import glob
	from UnityPy import AssetsManager
	from collections import Counter
	import zipfile
	from string import Template
	from filetranslate.service_fn import write_csv_list

	USE_YAML = False
	try: