Revover the files from harddisk or usb drives

Can we recover the files that have been deleted or recover the entire drive even it is formatted ?
Answer is Yes and No.
Before going to the methodology of recovering , let us understand what happens when we delete something.
As we all know that the data is stored in the form of 0's and 1's .
If any file is to be deleted, general convention is that all 0's and 1's should be converted to 0's but don't you think it is time taking process . so when you delete the file(s) or format , then the master file table reference, which merely tells the operating system where the file was located gets removed. Essentially, you're only removing the map to the data—not the data itself—while also giving the operating system permission to overwrite that area of the hard drive.so the answer is YES as it allows us to recover the data.
How to recover the data ?
Download test disk (http://www.cgsecurity.org/wiki/TestDisk) and follow the instructions in the site
Answer is No as the entire 0's and 1's are converted to 1's if your not doing quick format .

Files getting disappeared in removal drives

In present days it has been observed that many of the removable drives (pen drives, memory cards) when removed from some of the systems ,the files in it gets disappeared but the properties of the drive shows some size is occupied by the files . u can recover the disappeared files by opening computer , then opening the removable disk drive and typing *.* in the search box .The files will be displayed and select all the files ,cut and paste the files in the removable disk drive location.
Refer below if u want to know why it happens
The files which appeared to be disappeared were moved to a folder named space (which can be obtained by typing Alt+255 or Alt + 0160) which is different from space generated by pressing space bar(This space cannot be used to name a folder as folder name doesn't contain spaces) and the graphical view of folder usually yellow is changed to white which in turn makes the folder invisible.Finally, u are typing *.* in the search bcoz * is a wildcard character which stands for multiple characters in windows platform.

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