Why Today’s Data Recovery Tools are Better than Undelete.exe
Read to find out the difference between simple and obsolete data recovery software vs. present-day tools. Data recovery software has come a long way since the “unerase” tool was introduced in Norton Utilities 1.0 in 1982. A few years later, Microsoft added “undelete.exe” was added to MS DOS 5. Both tools relied on the properties of the file system (FAT16 at the time) to retain information about deleted files in its directory structures.
Years passed, but the way these early data recovery tools worked remained the same. These tools attempted to locate directory entries that belonged to deleted files, reversing the “delete” operation by simply changing a flag in the file system. This approach often resulted in unusable files and corrupted file systems. Needless to say it was less than perfect. Years after, drives grew from 360 KB diskettes to hard drives as large as 2 TB.
Today, no respectable vendor of data recovery tools will use this approach. The file system still gets scanned, but even the least sophisticated the tools will not directly write to the file system in an attempt to “reverse” the deletion. Instead, the tools will attempt to read sectors previously occupied by the deleted file, reconstructing the file and saving it elsewhere (preferably onto another disk or USB flash drive).
This approach still relies on information kept in the file system after the file is deleted. But what if the file was deleted a long time ago, and its record is no longer available in the file system? Or what if the file system itself is no longer available after disk format or repartition operations? Finally, what if the partition itself is unreadable, corrupted or inaccessible?
Some of the better tools such as Hetman Uneraser went even further, offering additional means to locate deleted files besides reading the file system. A new range of algorithms was designed to analyze the entire content of the hard drive, looking for files still sitting on the disk. Available under a range of proprietary trade names, these methods are commonly referred to as “signature search” algorithms because they’re using characteristic signatures of known file formats to locate the beginning and calculate the length of each file.
Finally, the most advanced tools (Hetman Uneraser included) can combine both approaches, using information from the file system as well as data collected from the disk surface in order to see the full picture. By combining information from both the file system and the actual disk, these tools can handle pretty much any problem – from deleted files to formatted, corrupted and inaccessible disks.
What should users look for when selecting a data recovery tool for their needs?
What is the importance of selecting the right data recovery tool for a specific task?
Selecting the right data recovery tool for a specific task is important because it will ensure that the data can be recovered quickly and accurately. Different tools are designed to work with different types of data and may not be suitable for all tasks. If the wrong tool is used, it could lead to data corruption or even permanent data loss. Additionally, using the wrong tool could lead to longer recovery times and greater expense.
How can users avoid data loss and the need for data recovery tools?
What are some common scenarios where data recovery tools can be helpful?
Can modern data recovery tools recover data from RAID systems?
Yes, modern data recovery tools can recover data from RAID systems. They are specifically designed to do so and can recover data from RAID 0, RAID 1, RAID 5, RAID 6, RAID 10, and other configurations.
Read why today’s data recovery tools are better than undelete.exe and recommend it to friends. If you do have any questions, don't hesitate to contact our technical support service - we will be happy to help you.