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Data cleansing may also involve harmonization (or normalization) of data, which is the process of bringing together data of "varying file formats, naming conventions, and columns", [2] and transforming it into one cohesive data set; a simple example is the expansion of abbreviations ("st, rd, etc." to "street, road, etcetera").
Metadata removal tools are also commonly used to reduce the overall sizes of files, particularly image files posted on the Web. For example, a small image on a website, which may contain metadata including a thumbnail image , can easily contain as much metadata as image data, thus removal of that metadata can halve the file size.
As a copy-on-write (CoW) file system for Linux, Btrfs provides fault isolation, corruption detection and correction, and file-system scrubbing. If the file system detects a checksum mismatch while reading a block, it first tries to obtain (or create) a good copy of this block from another device – if its internal mirroring or RAID techniques are in use.
Data scrubbing is another method to reduce the likelihood of data corruption, as disk errors are caught and recovered from before multiple errors accumulate and overwhelm the number of parity bits. Instead of parity being checked on each read, the parity is checked during a regular scan of the disk, often done as a low priority background process.
Data scrubbing is the process of taking a data set with individually identifiable information, and removing or altering the data in such a way that the usefulness of the data set is retained, but the identification of individuals contained in that data set is nearly impossible. Scrubbing should be accomplished using a protocol developed to ...
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