The long range search depending on the compression method, dictionary If 'Auto' option is selected, WinRAR applies

'Long range search' options in 'Advanced compression parameters' dialog It increases memory usage and might reduce the compression speedįor some types of data. It helps to improve the compression ratio and sometimes speed Repeated data blocks, can be used when creating RAR archives. With 'Dictionary size' field in 'Archive name and parameters' dialog.Īlternate search algorithm, optimized to locate longer and more distant To customize dictionary sizes proposed in the drop down list associated 'Define dictionary sizes' dialog in 'Settings/Compression' can be used Unlike -md, -mdx is applied to extraction only and can beĪdded to RAR environment variable, not affecting archiving commands. Unpacking dictionaries up to and including the specified size. In the command line mode by default WinRAR refuses to unpack archives It is done to prevent the unexpected excessive memory allocation. Size in extracted RAR archive exceeds 'Maximum dictionary sizeĪllowed to extract' parameter in 'Settings/Compression'. WinRAR issues a prompt allowing to cancel or continue if dictionary In a solid archive, such as a collection of software ISO images It also can be efficient for sets of large similar files Increasing the dictionary size can improve the compression ratioįor large files with distant repeated blocks, like virtual machineĭisk images. So we are not limited to 4, 8, 16, 32, 64 seriesĪrchives with dictionaries exceeding 4 GB can be unpacked only Not power of 2 dictionary sizes can be specified for dictionariesĮxceeding 4 GB. Depending on the amount of physicallyĪvailable memory, dictionary up to 64 GB can be selected. Compression dictionary sizes larger than 1 GB are supportedįor RAR archive format.

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