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PeaZip is a free cross-platform file archiver that provides an unified portable GUI for many Open Source technologies like 7-Zip, FreeArc, PAQ, UPX...
Create 7Z, ARC, BZ2, GZ, *PAQ, PEA, QUAD/BALZ, TAR, UPX, WIM, XZ, ZIP files
Open and extract over 180 archive types: ACE, ARJ, CAB, DMG, ISO, LHA, RAR, UDF, ZIPX files and more...
Features of PeaZip includes extract, create and convert multiple archives at once, create self-extracting archives, split/join files, strong encryption with two factor authentication, encrypted password manager, secure deletion, find duplicate files, calculate hashes, export job definition as script.

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FAQ / COMMON ARCHIVE FORMATS > BZ2 FILE FORMAT
open source rar

BZ2 file, BZip2 compression algorithm



WHAT IS BZ2 FILE FORMAT

BZ2 extension



BZ2 extension designates a pure data compression format not providing file archival feature, its BZip2 compression algorithm is based on Burrows–Wheeler transform.

Compression speed is somewhat slower than zip/gzip classic Deflate algorithm (even if correctly implemented Bzip2 algorithm can be easily made parallel, and benefit of recent multi-core CPU), but faster than more powerful compression schemes as in RAR and 7Z formats. Compression ratio, also, is usually intermediate between older Deflate-based ZIP/GZ files and modern RAR, 7Z, ZPX formats.

Compressed files are usually identified by .bz2 extension, and can contain a single input file.
Due this by-design limitation, on Unix/Linux systems BZip2 compression (as well as Gzip, XZ,...) is usually cascaded to TAR archiving -  multiple files data and metadata (file attributes, date/time etc) are consolidated into a single uncompressed .tar container - producing TBZ2 file, which can be identified with TBZ, TB2, or TAR.BZ2 extension. Hint: learn more about files with double extension.

Read more about this topic on BZip official domainBZip online, and Burrows–Wheeler transformBZip2 compression entry on Wikipedia.

When is BZ2 format recommended
BZip2 compression is usually applied to TAR archives, which is usually employed to provide archiving of data and metadata on Unix and Unix-like systems, and it can also be used as alternative compression algorithm in ZIP and 7Z files - resulting archives can be read from most file archivers (including PeaZip).
It can be recommended when it is desired a better compression than classic Deflate-based ZIP compression, and in all cases it is preferable an algorithm faster and less heavy on memory and CPU than LZMA-based 7Z or PPMd-based RAR compression.

PeaZip supports creation and extraction of BZ2 files, can read (open, test and extract) and write (compress to) BZ2 file type. Also, PeaZip can be set to use BZip2 compression as alternative algorithm for ZIP and 7Z formats, in Advanced options tab.

  



  

.BZ2

Author Julian Seward, 1996

SPEED bz2 file type specifications
Good, designed with parallelism in mind can be, theoretically, implemented as separate threads for each input part.







COMPRESSION RATIO bzip2 algorithm specs

Good, improved over Deflate but lacking behind modern compression algorithms employed in RAR and 7Z formats.

ADVANCED OPTIONS what is bz2 archive
BZ2 is meany only for providing single-file compression, lacks archiving and encryption features by design.








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