7-Zip Configuration

Use this dialog box to configure the 7-Zip plugin. See Configuring Plugins for general information about configuration.

Options

Display dialog box with extended options before packing

When checked, the plugin displays the Create New Archive dialog box (or the Add Files to Archive dialog box if the archive already exists) before each pack operation to a 7-Zip archive. You can specify options for packing in this dialog (compression and encryption settings).

Show extended info when listing archive: Packed, Method

When checked, you can choose which of the following columns to display in the panel: Packed (packed size of file) and Method (compression method). Checked columns will be displayed in the panel.

Compression level

Choose the compression level. You can use one of the following values:

Value	Description
Store	No compression is used; files are stored in the archive in their original size.
Fastest	Very fast compression with a relatively low compression ratio.
Fast	Fast compression.
Normal	Recommended level of compression.
Maximum	Better compression, but it is slower and requires more memory.
Ultra	Best compression, but it is even slower and requires even more memory.

Compression method

Select the compression method. You can use one of the following methods:

Method	Description
LZMA	7-Zip's default compression method. It provides a high compression ratio and very fast decompression.
PPMd	Dmitry Shkarin's PPMdH algorithm with small changes. It usually provides a high compression ratio and high speed for text files.

Dictionary size

Enter the dictionary size for the compression method. A higher dictionary size means better compression, but it is slower and requires more memory. Memory usage for LZMA compression is about 10 times the dictionary size. Memory usage for LZMA decompression is close to the dictionary size. Memory usage for PPMd compression and decompression is almost equal to the dictionary size.

Word size

Enter the word length that will be used to find identical sequences of bytes for compression. For LZMA, a larger word size usually gives a slightly better compression ratio and a slower compression process. A larger word size parameter can significantly increase the compression ratio when files contain long identical sequences of bytes. For PPMd, word size has great significance. It strongly affects both the compression ratio and the compression/decompression speed.

Create solid archive

When checked, all files will be compressed as one continuous data stream. This usually improves the compression ratio.