So the real problem is: no matter how careful you're, sudden data loss could give you a head-on blow. But users don't need to feel despairing and be overthrown. What they really need to do under such circumstance is finding ways immediately to recover data from hard drive, USB flash drive, SD card or any other data storage devices.
The word "erase" basically has two meanings – data erasure and data remanence – according to Wikipedia:
- Data erasure is a software-based method of overwriting the data that aims to completely destroy all electronic data residing on a hard disk drive or other digital media.
- Data remanence is the residual representation of digital data that remains even after attempts have been made to remove or erase the data.
Whether users can unerase files successfully or not is closely related to the ways by which data are erased. Now, please take a closer look at the mentioned two kinds of file erasing situation.
2 Kinds of File ErasingAfter knowing file erasing have been divided into 2 types and reading the description of each type, you should be able to distinguish them roughly. But please don't worry too much even if you can't. Go ahead and read the following details.
Overwriting of Real Data ContentThis is a case of data getting lost due to overwrite:
"I bought new Lenovo laptop. And in my computer there was a drive listed as Lenovo recovery center and it's for reverting the computer to its original form. Apparently to get that space back I had to download it into another source. So I got my dad's 461GB hard drive and downloaded it in that. But I didn't read the message that came after that which said would you like to overwrite this drive and clicked yes. After a while it asked again and I said yes again. Then I checked the hard drive and found it completely empty. Immediately I stopped the program. Now I want to recover those files. They contain every picture we had since my grandparents wedding to my prom and I want to know how to recover it."
According to what the user said, we found his drive was overwritten by the downloading process; this user allowed the overwriting action by clicking yes directly without noticing the prompt message, as he said. Well, in this case, can his files be recovered?
Well, here is our analysis: the overwrite process done by downloading is only a process to remove old data and save new data here (similar to reformatting), not the real overwriting process of data content. So, we suggest that users should stop writing anything else to the drive, and then resort to the backup of his pictures or rely on powerful free undelete software to undelete files.
But, if users' files are really wiped by using special tools, they have no chance to unerase files from Windows 7/8/10 or any other operating systems. If you ask what is the real data wiping, the following content will give you a clear answer.
Data wiping: it refers to the process of erasing data by using data erasure technology and tools; this will actually delete data completely and make them unrecoverable. 3 commonest data wiping methods are "fill sectors with zero", "fill sectors with one" and "fill sectors with zero and one". All in all, the more times data are wiped, the less the possibility of data recovery will be.
So our advice is thinking twice before you actually set about wiping your drive. Otherwise, you'll suffered a lot from it if you suddenly found some important data are saved here in the wiped drive without making a backup in advance.
Removing of Data Related Information in FATThis is a case of data getting lost due to accidental erasing (deleting):
"I erased some very important files from HD and emptied out the recycle bin. Now this was a new HD i installed today and erased from an old HD on My PC. Now there isn't a system restore time set for me to go back and undo the changes. What can i do?!!!! My wife is going to kill me!!!!!!! HELP!!!!"
File deletion: each file is saved on the hard drive in two parts – header section and data section. Information like file name, file attributes and occupied cluster number is saved in header, which is saved in a cluster and mapped in FAT (File Allocation Table), while the real content of data is saved in data section.
The deletion operation we done normally is actually the modification of the first two codes in file header. This change is mapped in FAT to make a "deleted" flag. Meanwhile, the entry of cluster number occupied by the file is cleared in FAT, indicating the release of space. This explains why we usually find the disk free space increases after one or more files are deleted.
Usually, the files deleted from Windows hard drive will be put into Recycle Bin for a while, and this gives users a chance to regret their decision (they can go to Recycle Bin, right click needed files and choose "Restore" to get them back to original place). But, what if users have emptied the Recycle Bin out of habit or due to other reasons? In this case, users also don't need to be anxious, since we've got a great way to help them recover permanent deleted files with ease.
MiniTool Power Data Recovery is a wonderful free undelete program/utility we highly recommend for even inexperience users to recover deleted files when necessary.
Drive formatting: actually, formatting refers to the operation of disk initialization and reformatting will delete all files on the target drive. It can be divided into 2 levels, which are respectively low-level formatting and high-level formatting. If there's no special instruction, hard disk formatting usually refers to high-level formatting while floppy disk formatting can include both.
High-level disk formatting is also known as logical formatting; it refers to the operation of disk initializing and disk partitioning (while reformatting includes deleting original disk partitions and files in those partitions). And this operation was done by writing specific data into specific disk area according to the file system (like NTFS and FAT32) users have selected.
Well, users may wonder whether they can undelete files for free after performed file deletion or drive formatting unintentionally. It's reasonable that doubts like this will pop into users' head; after all, everyone tends to make mistakes during operating disks & partitions and the natural response after such mistake is trying to complete file undelete. The difficulties lie in that whether the files can be recovered and how to recover them safely and successfully.
In conclusion, the biggest difference between above 2 kinds of data erasing lies in that: data erased by the former way are lost permanently while those erased by the following two ways could be recovered as long as they're not overwritten by new data.
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Tutorial on How to Unerase FilesAfter mistaken deletion or formatting was made, users should stop using the disk right away – try their best to avoid data overwriting so as to maintain data integrity and enhance data recovery possibility.
Users should download MiniTool Power Data Recovery and install it to computer if they're running Windows OS (otherwise, they should choose MiniTool Mac Data Recovery). Afterwards, they should do as we suggest in the following content to unerase lost but precious files and folders in person.
How to Undelete a File from Mistaken DeletionWe have already said that if users deleted a file from computer hard drive and then realized it's a mistake, they can directly enter the Recycle Bin and choose to restore this file as long as the file is not deleted by "Shift + Delete" or the Recycle Bin is not emptied.
On the contrary, if the file is deleted permanently, users had better rely on MiniTool Power Data Recovery.
Choose "Undelete Recovery" from main interface -> select the drive which originally includes deleted file and scan it -> check the need file and save it to another drive.
If the file (files) needing to be recovered is large than 1GB, please buy a license to finish recovery steps since the free edition has a 1GB recovery limitation.
Even if files are deleted by pressing "Delete" only, as long as they are deleted from SD card or other kinds of USB files, they'll not be put into Recycle Bin. Users also need to resort to third-party recovery software to unerase files from SD card or undelete USB drive files.
How to Unerase Files and Folders from Drive Formatting
After users accidentally formatted a non-system drive, they should launch the recommended software -> choose "Damaged Partition Recovery" -> select the formatted drive to scan -> check need files and folders to save.
In brief, MiniTool Power Data Recovery can help users get rid of data loss problem in most cases. It owns over 1,685,539 users download from CNET, so you can us it without worrying.
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Wipe Data Completely with This Tool If You Need
- If users have replaced their old small hard drive with a new larger drive, of course, they want to dispose the old hard drive without privacy leakage. At this time, they could use our MiniTool Partition Wizard to "Wipe Disk" clearly.
- If users have transferred sensitive data from one hard drive partition to a removable disk, they may we well choose to "Wipe Partition" to avoid malicious recovery of sensitive data.
Select the disk needing to be wiped -> choose "Wipe Disk" from left action panel -> check a wiping method and press "OK" (at this time, users will be able to see pending operations in software) -> click "Apply" and choose "Yes" from pop-up window to conduct the pending operation(s).
Select the partition from which users want to clear data permanently -> choose "Wipe Partition" option from left action panel -> check a wiping method and press "OK" -> click "Apply" to see a prompt window -> click on "Yes" to start wiping the partition.
If users have any questions about how to use programs recommended here, please feel free to leave us a message on the certain page and we will reply you very soon according to your specific situation.