|Author: satish 22 Apr 2012 Member Level: Bronze Points : 3 Voting Score: 0|
Dear ISC user,
I am very glad that you are aware of the fact that the data once erased from the hard disk can easily be recovered useing small utilities.
A simple hard disk is a magnetic one on which the lead writes the raw bits in the form of 1's and 0's even if we delete the data, we can recover it by recovering the raw data from the magnetic disk. if u want to precent it from happening, then simply delete all your data and fill it for 2 or 3 times.
The best wat to precent data recovery is just to delete all the data and re fill the Entire free space with some other data like movies and songs. Do it for atleast two times. This erases the traces of old data which privents from being recovered.
I dont prefer depending on any softwares. Because I believe we are the superiors of everything.
|Author: Ashok Kothari 23 Apr 2012 Member Level: Bronze Points : 1 Voting Score: 0|
I am very much agreed with what satish said. But you can try CyberScrub software which will delete your all the data. Just download the trial software and use. if you find it worth go for buying it.
|Author: Lakhbir Singh 26 Apr 2012 Member Level: Bronze Points : 10 (Rs 7) Voting Score: 0|
Dear ISC User,
We must first understand Memory Management part of the Operating System.
Data on the disk is residing on various sectors whose entry is kept in the FAT (File Allocation Table)
Operating System like Windows instead of deleting data from the sectors of the disk, simply removes its entry from the FAT ( this is done to speed up deletion process) moreover with several write and delete operations the data on the disk gets fragmented (spreads all over the disk).
When a write operation is carried out, the first available sector is selected (from FAT) and the other free sectors which may not be in the sequential order (due to fragmentation).
So, its not necessary that we are copying the data on the same free sectors that were emptied by the previous deletion operation.
Moreover, things get more complicated when some critical or private data was copied/created on the same partition where the operating system is residing (like c:/my documents folder etc.) and later some programs or operating system components were removed.
Windows is also continuously writing data on the disk (user may not be aware of this because this is carried out by the OS itself for e.g. Swap File: content present in RANDOM ACCESS MEMORY is written on the disk, etc.)
Practically, on large disks copying, data on the exact available free space is very difficult. For eg.
suppose free space left is 25225350 i.e. 25 GB + 200 MB + 25 KB + 350 Bytes and data being copied is 25225351 the operating system will flash out message " Disk full please free some space"
Some free sectors containing critical data are bound to be left empty, moreover, media data like movies, songs are in different format ( 1000 KB = 1 MB) whereas in the language of OS (Memory management 1024 KB = 1 MB) and this is one of the main reason why OS reports less space on newly bought disk for e.g. when we buy a 50 GB hard disk and then find windows reporting space less than 50 GB.
Hence, practically finding exact data that will be copied on the all available sectors (that to on the same sectors) on the Disk is impossible.
Keeping in the mind that the questioner wants data to be deleted so that it can NEVER RETURN and we do not know the type of data to be securely deleted (it can be a simple and small text file residing on 2 to 3 sectors).
So one needs to install software like Eraser (freeware) Or East-Tec Eraser (available for free trail) and then select a good 35 pass algorithm (gutmann); delete the confidential data and then select option available in the software "WIPE OUT FREE SPACE ON THE DISK" and it will wipe out every sectors intelligently by checking FAT entries and its corresponding sectors on the disk; scramble file names; wipe-out OS residues and locked OS files.
Then only we can be very sure that data will NEVER RETURN (not even a small text file).
Finally, I believe companies making secure deletion software are earning more than us (comparing to what we are earning or are trying to earn on ISC) and are definitely far more superior than us.
|Author: Shashikanth Vydyula 04 May 2012 Member Level: Gold Points : 3 (Rs 2) Voting Score: 0|
There are many softwares which will undelete the deleted files.
So to permanently delete data from your hard disk open command prompt by typing cmd in run program. Now type in "format c:/u" it is unconditional formatting of drive c which is secure than quick format.You can type in other partitions like d,e or f.But if you format c you have to reinstall OS again.
Softwares like Evidence elimainator,Cyber scrub ciber side and window washer are very effective in permanently deleting data.
|Author: Andrew 06 Jun 2012 Member Level: Bronze Points : 1 Voting Score: 0|
Deleting the files from the computer system simply does not mean that they have been deleted permanently. They can be recovered from the Recycle Bin or by using some backup recovery program by some hackers or some unauthorized persons. The tool Kernel File Shredder helps in permanently deleting the vital information or database records of organizations from the client's network.