Disk compression
software utility
Disk compression increases the amount of information that can be stored on a disk by automatically compressing and decompressing data as it is written to and read from it. A disk compression utility is software that provides disk compression by overriding the system's file access layer so that all programs participate in compression. When a program writes a file, the utility compresses the data before storage. When a program reads a file, the utility decompresses the stored data before providing it to the program.
Disk compression uses a single, normal file for storing the logical, user-visible files of a disk volume. This file tends to be relatively large and acts as a virtual drive. Typically, access to the compressed storage is via device driver. Similar utilities automatically compress and decompress each file instead of using a single, large file, but such a utility is not classified as disk compression.
Unlike a file compression utility which is generally interactive (user specifies which files to compress and when to compress them), a disk compression utility is noninteractive (files are processed automatically as part of normal file use). This automatic behavior is sometimes described as on-the-fly, transparent, real-time and online.
“Disk compression” enters the record as software utility. Crown Archives preserves that source wording while asking what Disk, compression and software can confirm, complicate or overturn.
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The date and method of observation matter as much as the stated conclusion, especially where classification or consensus has changed. The source revision retrieved here is dated Jun 1, 2026. The linked authority identifier is Q5282310. None of the 0 selected statements returned an explicit reference.
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This entry incorporates text from “Disk compression” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.