its about recovery of data by the use of several software and hardware techniques

1. G. H. RAISONI COLLEGE OF ENGG. & MANAGEMENT
Gat No. 1200, Wagholi, Pune – 412 207
DEPARTMENT OF COMPUTER ENGINEERING
TAE:- 1
(An Autonomous Institute Affiliated to Savitribai Phule Pune University)
TOPIC : Data Recovery Techniques
Presented by :
1) Venkatesh Pensalwar (TCOB93) 2) sanket uttarwar(TCOB98)
3) Shivam Ramanvar (TCOB95) 4) Shivam Ranjwe (TCOB96)

2. What is Data Loss?
 Data has accidentally been erased or data
control structures have been overwritten.
 Data has been corrupted or made
inaccessible.
 Data is unable to be accessed from a previous
functioning computer system or backup.

3. Data Recovery
 Data recovery is a process of salvaging inaccessible data from damaged
or corrupted secondary storage , when the data store cannot be
accessed in a normal way.
 The data is most often salvaged from storage media such as internal or
external hard disk drives (HDDs), USB flash drives , solid-state drives (SSDs),
magnetic tapes, CDs, DVDs, and other electronic devices.

4. What Causes Data Loss?
 Natural Disaster
 Hardware Error
 Virus Attack
 Human Error
 Intentional deletion
 Accidental overwriting of files
 Software Corruption

5. How to Prevent Data Loss
 Don’t upgrade hardware or software without having
a backup
 Physically secure your system from intruders
 Use firewalls and virus protection
 Be prepared for physical disasters

6. Data Recovery Techniques
 Use of software to recover data
 Use of machines to recover data

7. Software or logical Data Extraction
 Data extraction is the process of moving data off of
the imaged drive to another destination location.
 Data extraction software scans sectors of the hard
drive and restructures the file system either in
memory or another hard drive.
 The software can be used to copy the recoverable
data to a destination location.

8. Software Recovery
 Data loss can occur because the hard drive may have
problems accessing the data it contains at a software or
logical level.
 By making an exact copy including all deleted information) of
the hard drive, using a program such as Norton GHOST, most
data recovery programs search for deleted MFT (Master File
Table) entries to undelete files.
 If the MFT is corrupt or defective, this method will not work.
Some data recovery programs will ignore the MFT and search
all of the unallocated clusters to try to find and recover files.

9. Physical Data Recovery
 The user may send a failed hard disk drive to a
private data recovery company that offers secure and
confidential data recovery.
 The data recovery company will carefully perform
part replacement of the heads, spindle motor and
base casting, the electronics board, etc. in a clean
room environment.
 Part replacement has historically been successful for
data recovery about 40%-60% of the time.

10. Data Recovery Techniques
Scanning Probe Microscopy (SPM)
 A technique that is used to image and
measure surfaces at the atomic level.
 Scans an atomically sharp probe over a
surface which produces a 3D topographic
image of the surface at the atomic scale.

11. Data Recovery Tips
Do’s:
•Do try to back up your important data on a daily or weekly basis
•If your hard disk is not getting detected, do use a different cable to connect the hard disk
•After data loss, remove your storage device and keep it in a safe place
•If you are unable to access your storage drive and data is lost, then immediately stop
using your drive and download a data recovery software to get them back
•Do turn off your system, when you hear any clicking / grinding noise from your hard disk
•Do install an effective antivirus program to scan and remove viruses causing data loss
from your system

12. Don’ts:
•Don’t make attempts to recover your lost data by yourself
•Do not store your important data on hard disk having Bad sectors
•Don’t download application programs from unknown sites
•Do not store or copy new files to your hard disk after data loss as this can overwrite
the deleted / lost files beyond the scope of recovery
•Don’t try to open your physically damaged hard disk
Do not use any third party application software to create, delete or repartition your
hard disk

13. https://en.wikipedia.org/wiki/Data_recovery
https://www.geeksforgeeks.org/dbms-database-recovery-
techniques/
Reference links

14. THANK YOU