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Data recovery

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Data recovery

  1. 1. Data RecoveryAakash Mehta Bhaumik Chaudhari 10IT026 10IT053 Shankersinh Vaghela Bapu Institute Of Technology Nov 22nd, 2012
  2. 2. Overview What is Data Recovery? Disk Structure Software used Real World Uses Advantages & Disadvantages Demo Shankersinh Vaghela Bapu Institute Of Technology 2
  3. 3. What is data recovery? Retrieving deleted/inaccessible data from electronic storage media (hard drives, removable media, optical devices, etc...) Typical causes of loss include:  Computer Virus  Data Corruption  Computer Crime  Human Error Shankersinh Vaghela Bapu Institute Of Technology 3
  4. 4. Disk Structure A. Track B. Geometrical Sector C. Track Sector D. Cluster Shankersinh Vaghela Bapu Institute Of Technology 4
  5. 5. Several forms of Disk Storage Comparison of several forms of disk storage showing tracks. Shankersinh Vaghela Bapu Institute Of Technology 5
  6. 6. How data is Stored ? Data is stored into magnetic blocks which are in sectors. Every time you format HDD, new layer is created. With the increase of layers memory blocks are also increased and it results to variations in data transfer(Speed Decrease, Memory consumption high). Shankersinh Vaghela Bapu Institute Of Technology 6
  7. 7. How Data Is Recovered? At the First time Low Level Format(LLF) is performed on the hard disk, the disk’s platters start out empty. That’s the last time the platters will be empty for the life of the drive. If an LLF is done on a disk with data on it already, the data is permanently erased. The type of formatting that most users are familiar with is called high-level formatting and it is the process of setting up an empty file system. Shankersinh Vaghela Bapu Institute Of Technology 7
  8. 8. How Data Is Recovered? Data stored on the hard drive is not physically deleted during formatting. The hard drive is re-organized and the table with information where files are stored is reset. As long as the file system and its settings remain the same, none of the actual data previously stored on the hard drive is deleted or overwritten can subsequently be recovered. Shankersinh Vaghela Bapu Institute Of Technology 8
  9. 9. How Data Is Recovered? When Data is overwritten, the magnetic domains on the HDD are re-magnetized. This is an irreversible process that physically removes information previously stored in this location.  This would require the use of a Magnetic force microscopy (MFM) or similar technologies, to recover overwritten data successfully. There is no software or other technical way known to the public that can restore overwritten data. Shankersinh Vaghela Bapu Institute Of Technology 9
  10. 10. Software For Data Recovery Stellar Phoenix Windows Data Recovery Stellar phoenix Linux Data Recovery Get Data Back-NTFS Get Data Back-FAT Shankersinh Vaghela Bapu Institute Of Technology 10
  11. 11. Operating Systems Helix:- Helix is a Linux based forensics operating system.- It is combined system used to analyse the file system and also generates the reports. Encase:- It is also very rich utility designed for the professionals. Shankersinh Vaghela Bapu Institute Of Technology 11
  12. 12. Real World Uses Average User:  Recover important lost files  Keep your private information private Law enforcement:  Locate illegal data  Restore deleted/overwritten information.  Prosecute criminals based on discovered data Shankersinh Vaghela Bapu Institute Of Technology 12
  13. 13. Advantages Recover important data easily by using various software. If you work for an organization than your data should be most important and you need to recover at any cost if it is lost. Recover your personal photos, files and etc which is precious to you. Shankersinh Vaghela Bapu Institute Of Technology 13
  14. 14. Disadvantages There is no surety that all of the lost data can be recovered. Shankersinh Vaghela Bapu Institute Of Technology 14
  15. 15. Private Recovery Services Many private companies offer quick, secure, and confidential data recovery:  Computer Disk Service http://www.compdisk.com  20 GB from $195.00  46 GB and up – from $895.00  Action Front http://www.datarec.com/  External cases - $500 to $1500  Internal cases -$2500 to $4000 for a single hard drive  Critical Response services start at $5,000.  Data Recovery Services - http://www.datarecovery.net/ Shankersinh Vaghela Bapu Institute Of Technology 15
  16. 16. References "Data Recovery Solutions". R3 Data Recovery. Retrieved 13 October 2012.  "Computer Forensics Schools and Training" . Legal-Criminal-Justice-Schools.com. Retrieved 13 October 2012.  Zeno, Keneth (27 September 2011).  "How Does Data Recovery Work?" . Data Recovery Box. Retrieved 29 February 2012.  Secure Deletion of Data from Magnetic and Solid-State Memory , Peter Gutmann, Department of Computer Science, University of Auckland  Data Remanence in Semiconductor Devices , Peter Gutmann, IBM T.J. Watson Research Center  Feenberg, Daniel (14 May 2004).  "Can Intelligence Agencies Read Overwritten Data? A response to Gutmann." . National Bureau of Economic Research. Retrieved 21 May 2008. Data Removal and Erasure from Hard Disk Drives  "Disk Wiping - One Pass is Enough" . Anti-Forensics. 17 March 2009.  "Disk Wiping - One Pass is Enough - Part 2 (this time with screenshots)" . Anti-Forensics. 18 March 2009.  Wright, Dr. Craig (15 January 2009). "Overwriting Hard Drive Data" .  "Data Recovery Possible on Securely Erased SSDs" . Retrieved 22 November 2011. Shankersinh Vaghela Bapu Institute Of Technology 16
  17. 17. QUESTIONS? Shankersinh Vaghela Bapu Institute Of Technology 17

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