10 Data Recovery Tools You Can Download

In cases of disaster strikes, file get deleted or corrupted accidentally or some unfortunate happen that prevents access of files. For such there is no need to fret since once a file is deleted, the file is recoverable as the system marks the residence of the file as reusable hence removing from its index the file. This then gives a period of recovery of the file. Below is a list of tools free to download and you can use to recover files from full partition rescue to simple recovery of files.


1.) PhotoRec.

PhotoRec is very powerful recovery tool type command line that recovers data lost through bypassing system file and works perfectly in cases where your computer cannot have any access to the drive but can see it. The application works on multiple platforms and different formats of drives even drives in OS X.


2.) Recuva.

Recuva comes with multiple tools to make easier recovery of data. Recuva scans drives deeply and helps recover deleted data from drives or drives that are formatted and damaged. This application is capable of recovering data lost due to power off or unsaved work from applications such as email or Microsoft Word temp folder. The application comes with a wizard to guide on its working and implementation.


3.) TestDisk

TestDisk is accompanied by PhotoRec package that will be used to repair broken system file then make drive usable requiring no formatting and the data in it too. The application cuts on time spend on recovering large amounts of data. The application rebuilds Windows formats and is available for use on different operating systems.

4.) Ultimate Boot CD.

This application contains tools to edit, save or scan computers data or drive. The application tools also aid in recovering data in case booting is not possible into the main OS. Some of the tools are PhotoRec and TestDisk.


5.) UndeleteMyFiles Pro.

This application not only contains tools to assist in recovery of data but as well items to help in the process of recovery. Features include, the standard feature which aids in searching the files deleted and restores the files and Emergency Image which allows snapshotting of disk image of the drive in case an accidental activity overwrites data.


6.) Pandora recovery.

This tool allows you to review your drive for data deleted and then is capable of previewing text and photo files just before their restoration. The application is also able to find then restore compressed, hidden, encrypted and archived files. It also gives a message on whether the process of recovery depending on overwritten data if it will be successful.


7.) Restoration.

Restoration comes as EXE file that requires no installation for it to run and is small in size, 400KB. It is a must have app as it runs easily on Windows machine.


Disaster recovery techniques for database systems

Recovery techniques are an important factor in the database management systems. The database recovery system is a highly complex system composed of many transactions that are being executed each second. The system may undergo different types of failure including;


  1. Transaction failure

When a transaction fails to execute, it has to abort. The failure maybe as a result of:

  • Logical errors

This refers to any internal error such as code errors that make a transaction to be incomplete.


This is where the database management system aborts an active transaction due to a system failure condition such as deadlock.


  1. Disk failure

Disk failure attributed to, when the hard-disk drive fails due to disk head crash and bad sectors among others. This annihilates the disk partially or fully.


  1. System crash

External errors such as power supply shortage may lead to a sudden stop in the system activities which may cause the system to crash thus leading to loss of certain data that had already been executed.


When the system undergoes such failures, it has to undergo some sort of techniques to recover the lost data. Such techniques may include:


  1. Incremental backup

This is an efficient and reliable way of backing up your data. Files that have been changed are copied to archive after a transaction is completed or at intervals. In incremental backup, not all files are backed up, it’s only the once that have been modified overtime.


Incremental backup is fast and reduces the storage space since the only backed up data it consists is the modified files. During recovery of data, it provides grounds whereby data can be recovered to a more precise point in time. However, it takes long to restore data

  1. Audit trail

This refers to a series of activities on log files that are recorded. This technique provides security since it records all activities from all users. If data is lost, the audit trail, gives track of track accessed files, whether complete or attempted. It is essential in recovering data since it traces the transactions that have altered the log records.


  1. Differential files

Differential files refers to the differential backup type in which data is preserved and only the difference in data is saved since the last full back up. Differential back is quicker in terms of data recovery time since it only requires a full back up and the last differential backup to restore the lost data.


  1. Salvation program

This technique is applied when all other methods of data recovery fail. It is often put into effect after a system crash so as to restore the system to a valid state and is normally applicable where in buffers were lost in a system crash. Salvation Data has data recovery tools that prevent data loss and also necessitate high success rate in data recovery.


  1. Multiple copies

During the database transaction operations, multiple copies of each active files are maintained. The essence of this is to ensure that, in case of failure, different versions of files are available and can be recovered easily by making comparisons between the versions that can help in finding a consistent state version of the file. In this case, a valid state version of a file can be restored easily.

These techniques are very essential in data restoration in case of a disaster. However, not all data may be recovered but at least some of it is guaranteed.