Overwriting (Computer Science)
- Overwriting (Computer Science)
Overwriting is a process of writing a binary set of data on a memory. In general it writes over the previous data, hence the name. Overwriting generally occurs when unused file system clusters are written upon with new data, though overwriting is also used in security algorithms. These algorithms use a precise set of rules to remove any part of an original data from the memory by writing a new raw data on the memory.
Data that has been overwritten, even just once, is generally considered to be unrecoverable. There have been theories regarding the feasability of recovering overwritten data, but none have been put into actual practice. As such there is no evidence in favour of recovering overwritten data, but several suggesting it is entirely impossible. Many urban myths claim it's possible, but often these claims stems from recovering files that have not actually been overwritten.
Wikimedia Foundation.
2010.
Look at other dictionaries:
Overwriting (computer science) — Overwriting is a process of writing a binary set of data on a memory. In general it writes over the previous data, hence the name. Overwriting generally occurs when unused file system clusters are written upon with new data, though overwriting is … Wikipedia
Garbage collection (computer science) — This article is about garbage collection in memory management. For garbage collection in an SSD, see garbage collection (SSD). For other uses, see garbage collection. In computer science, garbage collection (GC) is a form of automatic memory… … Wikipedia
Computer recycling — Computer monitors are typically packed into low stacks on wooden pallets for recycling and then shrink wrapped.[1] Computer recycling or electronic recycling is the recycling or reuse of computers or other electronics. It includes both finding… … Wikipedia
Computer virus — Not to be confused with Malware. A computer virus is a computer program that can replicate itself[1] and spread from one computer to another. The term virus is also commonly but erroneously used to refer to other types of malware, including but… … Wikipedia
Data erasure — (also called data clearing or data wiping) is a software based method of overwriting data that completely destroys all electronic data residing on a hard disk drive or other digital media. Permanent data erasure goes beyond basic file deletion… … Wikipedia
Data remanence — is the residual representation of data that remains even after attempts have been made to remove or erase the data. This residue may result from data being left intact by a nominal file deletion operation, by reformatting of storage media that… … Wikipedia
Data recovery — is the process of salvaging data from damaged, failed, corrupted, or inaccessible secondary storage media when it cannot be accessed normally. Often the data are being salvaged from storage media such as internal or external hard disk drives,… … Wikipedia
Computers and Information Systems — ▪ 2009 Introduction Smartphone: The New Computer. The market for the smartphone in reality a handheld computer for Web browsing, e mail, music, and video that was integrated with a cellular telephone continued to grow in 2008. According to… … Universalium
Hash table — Not to be confused with Hash list or Hash tree. Unordered map redirects here. For the proposed C++ class, see unordered map (C++). Hash Table Type unsorted dictionary Invented 1953 Time complexity in big O notation Average Worst case Space … Wikipedia
Page table — A page table is the data structure used by a virtual memory system in a computer operating system to store the mapping between virtual addresses and physical addresses. Virtual addresses are those unique to the accessing process. Physical… … Wikipedia
