You cant.
You don't. Once it has been deleted, it's gone.
Data recovery software does exactly that. It finds items that have been deleted off of a computer. You can purchase the software or go to a trained expert to help you do this.
In most cases yes. You will need too find appropriate software to recover the files though.
Emails once deleted can be recover from trash can in yahoo my account inactive and after active All email messages, folders, attachments and preferences have been deleted,now how do recover?
IF you meant 'retrieve deleted data' - there is software available that will recover deleted files - but only if the computer hasn't been used since the time of the deletion !
If you search for the website using a search engine, then select the Cached version you may get lucky if the website hasn't been deleted too long ago.
creating a new volume and recovering the files from a backup source
Deleted photos on a Windows 7 Personal Computer end up in the Recycle Bin. As long as the Recycle Bin has not been emptied any deleted photos can be restored.
No. Once photos have been deleted they are gone forever. Be careful as to what photos you are deleting.
As far as I know, it is impossible to recover data on the 3DS if it has been deleted. If you mean games you have downloaded from the eShop, then go onto the eShop and redownload it (subject to availability).
There are several programs on the market that can help recover data that has been deleted, or from a damaged hard drive. Some of these programs such as Recuva or Photorec are free and may be able to recover data at no cost.
If you have deleted files on a computer, but need them back, there is a way to retrieve the files. Once a file is deleted, it will go into the computers recycle bin. Once the recycle bin is open, there is a button at the top to restore deleted items.