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License & Registration
Bandizip License Policy
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Bandizip Edition Comparison
Bandizip MSE (Microsoft Store Edition)
How to receive a receipt
Refund Policy
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Exclusive features of Bandizip Paid Edition
How to use the Password Manager
How to use Repair Archive
How to use the Password Recovery
How to preview images in an archive with Bandizip
How to use Antimalware Scan on Archive
Features & Technical Terms
How to zip files with Bandizip
How to unzip files with Bandizip
How to use Extract Here (Smart)
How to split a large file into smaller files with Bandizip
How to use Unicode filenames in ZIP format
ZIPX archive format
7z archive format
ZPAQ archive format
Solid Compression
How to open RAR files
How to open ALZ and EGG files
How to use Fast Drag and Drop
How to use Multi-core Compression
How to use High-speed Archiving
How to modify an archive without decompression
How to open a file in an archive without extraction
How to edit a file and save it in an archive directly
How to set a password for an archive
How to encrypt filenames in archives
How to move files to Recycle Bin (Trash) when deleting
How to compress a file even when the file is used by another process
How to use Parallel Extraction
Expand folder tree automatically
How to prevent data corruption by safe backup
How to test an archive
How to copy Zone.Identifier information for malware protection
How to change the theme color for Bandizip
How to export and import Bandizip settings
How to uninstall Bandizip
Update types
Command Line Parameters
Bandizip Setup Command Line Parameters
Bandizip on Windows 10 on ARM
How to troubleshoot when I can’t register Bandizip
How to troubleshoot when I can’t access the email account that I used to buy Bandizip
Automatická detekce kódování stránky nepracuje správně
How to troubleshoot when Bandizip opens archive files automatically when I download them on the browser
How to troubleshoot when an icon for archives doesn’t appear properly in the File Explorer
How to troubleshoot when a right-click menu (context menu) for Bandizip doesn’t appear
How to troubleshoot when a right-click menu (context menu) for Bandizip isn’t displayed properly
How to troubleshoot when the compression or decompression speed is too slow
How to troubleshoot when Error 22 occurs and Mac Finder on Catalina can’t extract a ZIP archive
How to troubleshoot when Mac Finder can’t extract an encrypted ZIP file
How to use a non-alphabetic language character in a password
How to test multiple archives
How to troubleshoot “The parameter is incorrect.”
How to troubleshoot when Bandizip conflicts with Sticky Notes
How to troubleshoot when I can’t open an archive in a network mapped drive
How to troubleshoot when a split archive can’t be decompressed
How to troubleshoot when bdzsfx.x86.sfx is diagnosed as malware
How to run Bandizip on Linux using Wine

Solid Compression

To learn about solid compression, you need to understand first how compression of common ZIP format works.

Compression of common archive formats (ZIP, LZH, ARJ...)

The following image shows the structure of ZIP format; ZIP and other formats not supporting solid compression, process all the files to be archived as individual files.

For example, when you archive file1.txt, file2.txt, and file3.txt in, each of the original files is compressed individually in as below.

Solid compression

Solid compression, on the other hand, is a method of processing multiple files as a single unit. Processing files as one unit has an advantage of a higher compression ratio if there is any similarity between the files.

7Z and RAR formats support solid and non-solid compression both. TGZ(tar.gz), TBZ(tar.bz2), and TXZ(tar.xz) are some types of TAR formats used together with other compression methods, and they are also considered as solid compression formats.

Disadvantage of solid compression

Though solid compression has the advantage of the high compression ratio, it has its disadvantage as well. When multiple files are compressed in a single solid block, the solid block is one unit and the file located in the middle of the block cannot be decompressed immediately.

As shown in the example below, file2.txt is a very small file. To decompress file2.txt, however, file1.txt located in the front of the block needs to be decompressed first and only then can file2.txt be decompressed.

Compression with multiple solid blocks

To improve the low accessibility to the compressed files in the middle of the single solid block, 7Z and RAR formats support compression of multiple solid blocks.

If a user specifies the size of the solid blocks, the files are processed as multiple solid blocks in the specified size. By this method, a high compression ratio and accessibility to the compressed files can be achieved at the same time.

Bandizip supports specifying the solid block size of 7Z format as below.