It increases memory usage and might reduce the compression speed for some types of data. It helps to improve the compression ratio and sometimes speed for redundant data like big text files. Alternate search algorithm, optimized to locate longer and more distant repeated data blocks, can be used when creating RAR archives. "Define dictionary sizes" dialog in "Settings/Compression" can be used to customize dictionary sizes proposed in the drop down list associated with "Dictionary size" field in "Archive name and parameters" dialog. Unlike -md, -mdx is applied to extraction only and can be added to RAR environment variable, not affecting archiving commands. Use -md or -mdx to allow unpacking dictionaries up to and including the specified size. In the command line mode by default WinRAR refuses to unpack archives with dictionary exceeding 4 GB. It is done to prevent the unexpected excessive memory allocation. WinRAR issues a prompt allowing to cancel or continue if dictionary size in extracted RAR archive exceeds "Maximum dictionary size allowed to extract" parameter in "Settings/Compression". It also can be efficient for sets of large similar files in a solid archive, such as a collection of software ISO images differing by version or localization. Increasing the dictionary size can improve the compression ratio for large files with distant repeated blocks, like virtual machine disk images. 64-bit WinRAR version is needed to unpack archives with dictionaries exceeding 1 GB. Archives with dictionaries exceeding 4 GB can be unpacked only by WinRAR 7.0 or newer. So we are not limited to 4, 8, 16, 32, 64 series and can use values like 5 GB or 22 GB. Not power of 2 dictionary sizes can be specified for dictionaries exceeding 4 GB. Depending on the amount of physically available memory, dictionary up to 64 GB can be selected. Compression dictionary sizes larger than 1 GB are supported for RAR archive format. WinRAR 7.00 () WinRAR - What's new in the latest version Version 7.00 1.
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