Data recovery, also known as Datenrettung, is the procedure used to extract data from corrupted or inoperable storage media. Storage devices including CDs, DVDs, Floppy Disks, Hard Drives, Magnetic Tapes, etc. are used for data recovery. The data becomes inaccessible for two different reasons. They affect the storage media physically and logically.
Storage media can sustain physical damage in a variety of ways. Magnetic tapes are prone to breaking, wrinkling, and dirt accumulation. CDs and DVDs are susceptible to scratches and damage to the metallic layer. Hard drives’ magnetic heads and motors are both susceptible to failure. Due to bending, overheating, freezing, dust, etc., the floppy is known for failing repeatedly.
Other factors, such as electrical surges and fires, might lead to the loss or inaccessibility of data. Data can be retrieved from magnetic or optical media using a variety of techniques. Magnetic force microscopy (MFM), scanning probe microscopy (SPM), magnetic force scanning tunneling microscopy (STM), etc. are the techniques that are most frequently utilized.
These techniques involve placing a pointed magnetic tip close to the surface being studied. It engages in magnetic field stray interaction. After creating an image of the data, any logical damage is repaired, and the data is subsequently retrieved. Data recovery is done by numerous businesses.
The harm to the file system is logical. It also informs us that we should exercise caution and have a reliable method in place for data recovery, or datenrettung, as the issue is software-related rather than physical. It typically happens because power outages, computer failures, etc. prohibit the writing of file system structures, leaving the file system in an inconsistent state.
Physical damage is less frequent than logical damage. Infinitely repeating file directories, data loss, system crashes, hard disks reporting negative space, and other unusual behaviors could result from this. The operating system cannot mount the file system as a result.
The majority of operating systems have repair tools, such as the chkdisk facility in Windows, the fcsk utility in Linux, and the disk utility in Mac. Compared to operating systems, there are other specialist programs that offer better repair capabilities.
Other systems known as journaling file systems, such as NTFS, EFS (used in Windows XP), ext3, and xfs, can be restored to their earlier consistent state. The amount of data loss is decreased by these file systems.
The best method of preventing data loss is data backup, which is also the most often used method of data recovery (datenrettung). Keeping data on disks without an operating system loaded is the easiest method. The other way is to backup data online or on magnetic cassettes, CDs, or DVDs.
It’s crucial to have backups for databases. Three forms of data backup exist. Backing up all data is a full backup. Backup that is incremental only includes the files that have changed. Differential backup combines the two of these. Another technique is continuous data protection, which copies data from one computer in a network to another whenever it is written to a disk.
The majority of private individuals who own computers only utilize them without doing anything beforehand. When an event occurs, it is too late for them to learn about data recovery or datenrettung.