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File Deletion

H

HFS+

Senior member
How come when you delete a file, it still can be recovered? I thought when a file is deleted it is deleted forever.
 
HFS+ said:
How come when you delete a file, it still can be recovered? I thought when a file is deleted it is deleted forever.
Click to expand...
Nope. All normal deletion does is update location references and metadata to no longer list the file or point to its contents. Some filesystems support what is called secure deletion, which overwrites the contents as well (doing this at a higher software level offers no guarantees), but is slower because of it.
 
As Cerb has said, traditionally Windows marks the area on the HDD as no longer required and eventually the HDD will overwrite that space with new data, until that happens data can be recovered using many tools.

I would assume that an SSD makes this a little more complex. With TRIM and GC, once an area has been marked as no longer required, the SSD in idle time will clean the block so it has no data in it any longer, obviously then it cannot be recovered.
 
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