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Libro de recuperación de datos

Publicaciones BPB ,

Nueva Delhi, India.

ISBN : 81-7656-922-4

Autor del libro

"Recuperación de datos con y sin programación"

Título del libro	Recuperación de datos con y sin programación
Autor del libro	Tarun Tyagi
Editores del libro	Publicaciones BPB, Nueva Delhi, India
Número de páginas	540
Tamaño	(9,5 x 7,5 x 1,0) pulgadas
ISBN	81-7656-922-4

Tarun Tyagi ha escrito este libro sobre programación de recuperación de datos profesional titulado "Recuperación de datos con y sin programación" . Todo el software educativo y los códigos fuente que se ofrecen en este sitio web han sido desarrollados por el autor Tarun Tyagi .

Tarun Tyagi es un profesional de recuperación de datos y desarrollador de software de recuperación de datos.

Capacitación en recuperación de datos por el autor Tarun Tyagi

Estudio de referencia rápida
Estudio de referencia rápida	Estudio necesario y recomendable
Protección de datos y copias de seguridad	Capítulo 1 , Capítulo 3 , Capítulo 7 , Capítulo 11
Analizando manualmente el Disco y Crash	Capítulo 3 , Capítulo 4 , Capítulo 7
Problemas de capacidad y hardware del disco duro	Capítulo-2 , Capítulo-3
Recuperación de archivos eliminados	Capítulo 3 , Capítulo 10
Recuperación de datos de/desde un disco formateado	Capítulo 3 , Capítulo 11 , Capítulo 14
Recuperación de datos de un sistema operativo averiado	Capítulo 3 , Capítulo 11 , Capítulo 12 , Capítulo 13 , Capítulo 14
Recuperación de datos de particiones perdidas	Capítulo 3 , Capítulo 12 , Capítulo 14
Recuperación de datos de un disquete ilegible	Capítulo 3 , Capítulo 10
Recuperación de datos tras llenado parcial de ceros o uso parcial de borrados de datos	Capítulo 3 , Capítulo 14
Borrado de datos o eliminación segura (no recuperable) de datos	Capítulo 3 , Capítulo 15

Tabla de contenido

PREFACIO

Capítulo 1 Una descripción general de la recuperación de datos

Introducción a la recuperación de datos
Entendiendo la pérdida de datos
- Fallo del sistema
  - Error humano
  - Corrupción de software
  - Mal funcionamiento del software
  - Error de hardware
  - Fallo de virus
  - Sabotaje
  - Desastre natural
- Otros tipos de pérdida de datos
  - Pérdida de una o más particiones
  - Error de lectura de disquete
  - Eliminación de datos importantes
  - Pérdida de contraseña
Tipos y áreas de recuperación de datos
- Analizando un ordenador antes de la recuperación de datos
- Período de recuperación aceptable
- Comprender los distintos costos
  - Costos de tiempo de inactividad
  - Costos de recuperación de datos
- Descripción del usuario
- Definición de los requisitos
- Estableciendo objetivos
Algunos consejos antes de comenzar el procedimiento de resolución de problemas de disco o recuperación de datos
- Some tips to Protect your Data
- Make the Backups
  - Perform surface scanning monthly
  - De-fragment of data weekly
  - Use good antivirus program
  - Get into the habit of keeping your floppy write-protected
  - Do not use pirated games and software

Chapter-2 Introduction of Hard Disks

Introduction
Components of hard disk
- Disk Platters and Media
  - Read/Write Heads
    - Head Crash
    - Head Parking
  - Head Sliders, Arms and Actuator
    - Head Sliders
    - Head Arms
    - Head Actuator
  - Spindle Motor
  - Connectors and Jumpers
  - Logic Board
  - Cache and Cache Circuitry
Low-level hard disk geometry
Formatting
- Low-Level Formatting
  - Partitioning
  - High-Level Formatting
Formatted and Unformatted Storage Capacity

Chapter-3 Logical Approach to Disks and OS

BIOS
- The INT 13H Interface and INT 13H Extensions
  - Int13H Extensions
  - The 2.1 GB limit
  - The 33.8 GB limit
  - ATA Specification for IDE Disks - The 137 GB limit
- Two and Four Disk BIOS IDE Support
Limitations in File Systems
- FAT12
- FAT16
- FAT32
- NTFS
Cluster
Cluster Size
Logical Structure of a Hard Disk
Master Boot Record (MBR) or Master Partition Table (MPT)
Master Boot Record Format
- Partition Table Entry Format
  - Boot Type Indicator Byte
  - Starting Cylinder-Head-Sector Number of the Partition
  - File System Indicator Byte
  - Ending Cylinder-Head-Sector Number of the Partition
  - Relative Sector number of Beginning of the Partition
  - Number of Sectors of the Partition
- DOS Boot Record (DBR) / DOS Boot Sector
  - Number of Root Directories
  - Total number of Sectors
  - Media Descriptor
  - Number of Sectors of FAT
  - Sectors Per Track (or Sectors Per Head)
  - Hidden Sectors
- File Allocation Table (FAT)
  - How Windows detects the Improper - Shutdown
- Root Directory
- Long File Name (LFN)
- Data Area (or Files Area)
- Fragmented and Defragmented Data
- Identifying the cause of data corruption
  - Boot the system with bootable floppy
    - Verify the MBR Information
    - If MBR is okay, Verify DBR

Chapter-4 Number Systems

Introduction
Decimal Number System
Binary Number System
- Binary to Decimal number Conversion
- Decimal to Binary number Conversion
- Binary Number Formats
  - The Bit
  - The Nibble
  - The Byte
  - The Word
  - The Double Word
Octal Number System
- Binary to Octal Conversion
- Octal to Binary Conversion
- Octal to Decimal Conversion
- Decimal to Octal Conversion
Hexadecimal Number System
- Binary to Hexadecimal Conversion
- Hexadecimal to Binary Conversion
- Hexadecimal to Decimal Conversion
- Decimal to Hexadecimal Conversion
ASCII Code
Some important number system terms, often used for Data and Data Storage representation
- Byte
- Kilobyte
- Megabyte
- Gigabyte
- Terabyte
- Petabyte
- Exabyte
- Zettabyte
- Yottabyte
Common Data Storage Terms

Chapter-5 Introduction of C Programming

Introduction
Why use C in Data Recovery Programming
Let me assume that you know nothing in C
Let us start
Keywords
Compiling the program
Printing Numbers
Using Variables
Numeric Variable Types
- Initializing Numeric Variables
Operators
- Assignment Operator
- Mathematical Operators
- Relational Operators
- Logical Operators
- The Comma Operator
Something more about printf() and Scanf()
Control Statements
- The if else Statement
- The switch Statement
- The break Statement
- The continue Statement
Loops
- The while Loop
- The do while Loop
- The for Loop
- The goto Statement
Pointers
Array
- Character Arrays
- Accessing the Elements
- Initializing Array Elements
- Looping through an Array
- Multidimensional Arrays
Strings
- Some Common String Functions
- The strlen Function
- The strcpy Function
- The strcmp Function
- The strcat Function
- The strtok Function
Functions
- Pass By Value Functions
- Call-by-reference
- Dereferencing
Memory Allocation in C
- Reallocating Memory
- Releasing Memory
Structures
- Structures with Pointer Members in C
- Structure Initialisers in C
- Passing Structures to Functions in C
Union
- The union Keyword
- A practical use of a union in data recovery
File Handling in C
- The File Modes of fopen Function
- Closing Files
- Reading Files
- Writing to Files
Command Line Arguments with C
Bitwise Manipulators
- Bitwise AND
- Bitwise OR
- Bitwise Exclusive OR
- Bitwise Compliment
- Bitwise Shift Left
- Bitwise Shift Right
Functions to Binary–Decimal and Conversions
Function for Decimal to Binary conversion
Function for Binary to Decimal conversion
Debugging and Testing
- Syntax Errors
- Logic Errors
Testing
- Some testing principles
- White Box Testing
- Black Box Testing
- Equivalence Classes
- Boundary Value Analysis
- Devising a Test Plan

Chapter-6 Introduction to Computer Basics

Introduction
Basic concepts
- Central Processor
  - Central Memory
  - CPU Registers
  - Assembler structure
  - Advantages of the Assembler
  - Let me keep my promise
  - Storing and loading the programs
  - Segments
  - Data movement
- Interruptions
  - Internal Hardware Interruptions
  - External Hardware Interruptions
  - Software Interruptions
Int 20H, Terminate process
Int 21H, MS-DOS System functions

Chapter-7 Necessary DOS Commands

Introduction
Brief History
- Microsoft Disk Operating System
- (MS-DOS) Version 1.0
- MS-DOS Version 2.0
- MS-DOS Version 3.0 to 5.0
- MS-DOS Version 6.0
- MS-DOS Version 7.0 (Windows 95)
Necessary commands
- ATTRIB
- CD (or CHDIR)
- CHKDSK
- CLS
- COMMAND
- COPY
- DEBUG
- COM Extension
- EXE Extension
- DEL (or ERASE)
- DELTREE
- DOSKEY
- DIR
- DISKCOPY
- EDIT
- EXIT
- FC
- FDISK
- FIND
- FORMAT
- LABEL
- MD (or MKDIR)
- MORE
- MOVE
- RD (or RMDIR)
- SCANDISK
- TYPE
- XCOPY
Specification shortcuts, Wildcards and Redirection
- Shortcuts
- Wildcards
- Redirection
  - >
  - >>
  - <
  - |

Chapter-8 Disk-BIOS Functions and Interrupts Handling With C

Introduction
biosdisk and _bios_disk Functions
diskinfo_t Structure
absread and abswrite Functions
Interrupt Handling with C
- SREGS Structure
  - REGS Union
  - BYTEREGS and WORDREGS Structures
  - int86 and int86x Functions
  - segread Function
  - intdos and intdosx Functions
How to know the Physical Hard Drive Number
Interrupt 13H (INT 13H), ROM BIOS Disk Driver Functions

Chapter-9 Handling Large Hard Disks

First of all, let me tell you a Story
INT 13H Extensions
How to use INT 13H Extensions in C Programming
- Comments on Coding of the program

Chapter-10 Data Recovery From Corrupted Floppy

Why the floppy is not readable
- How to recover
- Method – 1
- Store the boot image of any fresh floppy
  - Making the image of DOS Boot Record of a good floppy
    - Comments on Program coding
  - Pasting the boot image to the first sector of Unreadable floppy
    - Comments on Program coding
  - Let us do it with single program
- Comments on Program coding
- Storing the boot Image in HEXADECIMAL Characters to use in our previous Program
- Comments on coding of the program
- Method – 2
  - What to do if Method-1 doesn't work
  - Copy all the data of media surface to a single file
    - Comments on Program coding
  - Thinking for the solution of sector(s) reading error
    - Comments on Program coding
  - Paste the Data from the file to the physical surface of fresh floppy
    - Comments on Program coding
  - Thinking for Logical Recovery for Deleted or lost Data
    - Comments on coding
    - Comments on coding
    - Comments on coding

Chapter-11 Making Backups

Why Backups
When and what to Back up
Backup of MBR (Master Boot Record) and its use
- Why Backup MBR
- What Can Be Recovered with the Backup of MBR
- Writing the Program to make Backup of MBR
  - Comments on Program coding
- Program to Restore the MBR from Backup
  - Comments on Program coding
Backup of DBR (DOS Boot Record) and its use
- Why Backup DBR
- What can be recovered with the Backup of DBR?
- Programs for Making and Restoring Backups of DBR
Complete Disk Imaging
- Writing the program for complete disk imaging
  - Comments on Coding
  - Comments on Coding

Chapter-12 Reading and Modifying MBR with Programming

Master Boot Record (MBR) or Master Partition Table (MPT)
Master boot record format
Partition Table Entry Format
Writing program to read the partition table of MBR
- Comments on coding
Program to find all logical partitions and their information
- Comments on coding
- Comments on coding
Modify MBR by Programming
- Comments on coding

Chapter-13 Reading and Modifying DBR with Programming

DOS Boot Record (DBR) / DOS Boot Sector
Reading DBR of Floppy and Small Volumes
Reading the DBR of Large Volumes
How to Recover DBR with Programming
- Comments on coding

Chapter-14 Programming for "Raw File" Recovery

Raw File Recovery
Headers and footers of some important file types
Writing a program for Raw File Recovery
- Comments on coding
INT 10H, function 01H - Set Cursor Type

Chapter-15 Programming for Data Wipers

Introduction
When the data becomes completely unrecoverable
Why data wiping is so important
Writing program for Non - Destructive data wiper
- Comments on logic and the coding of the program
Writing program for Destructive Data Wiper
- Comments on coding
Wiping Data Area of specific file
- Comments on logic and coding of program

Chapter-16 Developing more Utilities for Disks

Introduction
Hiding Partitions
How the partition becomes hidden
- Writing program to hide partition
- Comments on coding
- Writing program to Unhide the Partition
- Comments on Program
- Programa de escritura para eliminar la partición
- Comentarios sobre el programa
Formateo del disquete "Track 0 Bad"
- Escritura de la herramienta de edición de discos

APÉNDICE