#Permanent eraser windows reddit keygen#

#Permanent eraser windows reddit keygen#

Ok i got side-tracked a bit, so since we only deleted table of contents the file data must still be there? yes it is, however it is marked as empty space, so if you put a new file in its place, the computer will just write over it replacing the previous 1&0's with new ones. that's why deleting a big file takes much less time than copying it from another drive, and also why deleting multiple small files is slower than deleting one big file (since in case of multiple small files the computer deletes the entry in table of contents for each file)

Thats because it would take much longer and wear the disc out quicker. however it will not go to the corresponding 'page' to erase the actual data. The computer will go to the table of contents, and erase it. So lets say you have a photo, you put it in recycle bin, and click 'Empty recycle bin': Then it depends what you consider a 'Permanent deletion' When you search for that file, the computer will look trough that table of contents, and when it finds the image there, there will be attached information where the *actual* data of the image is on the disc, kind of like reading the page number from the table of contents, and opening the book on the right page. (Kind of like a table of contents in a book). So if you save an image to the hard drive, it will be saved in it's binary (1&0) form on the disc surface, and then the location of the data on the disc's surface will also be saved. On a traditional HDD Hard Disk Drive the data is stored in a circular spiral on the actual surface of the disc, the tiny segment of the disc can be magnetized to represent a 1, or not magnetized to represent a 0.Īs you might or might not know, all data in the computer world, at it's most basic form is stored as sequence of 1's and 0's. Well to understand that, first we need to know how files are saved on a hard drive:

(especially for mobile devices)įor government-related purposes, since the hypothetical hacker will have vastly more resources and effort put into recovering old files, the best way to make sure is to physically destroy any drive with classified data. If you are using a file-system that isn't NTFS, while it will still probably not give priority to over-writing over writing in previously-unused areas, it may be worth checking. There are older systems which would over-write any deleted file, and new technology doesn't always follow the same steps as the old.įrom what I know about SSDs, you still need to over-write any data to 'completely erase' it. Since this is a tech subject I'm sure a few pedants will argue with me about the very specific cases in which you could technically recover a file after over-writing it: so I will mention that this is only applicable to about 99.999% of PC-related cases.Įdit: actually worth mentioning, this is lay-man's terms and doesn't apply for all devices and file systems. It should be noted that once the file/storage gets overwritten, the file can no longer be recovered.