This makes sense because PhotoRec is a useful extension for TestDisk, and the two pieces of software are often used in tandem. The software described here usually comes as a double package in most distributions. However, the costs associated with this type of approach are often too high for private users. A lot more can be done in a laboratory setting that offers clean room technology and direct work on the magnetic disk platters. However the more that data is written to the disk – potentially overwriting the disk areas containing the deleted data – the less likely it is that a typical home user with common tools like TestDisk and PhotoRec will be able to recover lost data. (See the box "What Happens When Data Is Deleted?" for more information.)Īt this point, chances for retrieving data are excellent. Instead, the data delete process involves making a change to the first character of a file name thereby causing the data to become invisible in the filesystem.
No Overwrites, PleaseĪ basic rule about how data recovery tools work is that deleted data does not disappear completely in the same moment that the delete key gets pressed. However, if the hard drive is no longer accessible, but is still visible from the BIOS, or if a partition or data within a partition have accidentally been deleted, then it is time to use the forensic tools TestDisk and PhotoRec. The Linux Smartmontools can process and interpret the data for signs pointing to wear and tear of the drive.
One indicator that can be used to determine the health of a hard drive running under Linux is the hard drive monitoring software S.M.A.R.T. The SSD drives today are different they die quietly. They could then change out the drive before it became inaccessible. Users could therefore sometimes hear clacking noises when a hard drive was nearing the end of its life. Until a few years ago, all hard disks were mechanical. Damage to a hard disk has the habit of occurring quite unexpectedly once symptoms of mechanical fatigue appear. The latter two states occur more frequently than most users would expect.
A common saying for hard drives is that they have just three states: empty, full, and damaged. Then, I let TestDisk and PhotoRec show what they could do. To conduct this test, I destroyed a partition table and deleted about 600GB of data.
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