Maximum insertion size is several megabytes. Additionally to usual data erasures, the new recovery record is able to detect deletions and insertions of much larger size than in previous RAR versions. For single continuous damage 4.x and 5.0 efficiency is about the same. Smaller record, such as 1 - 2%, or less random damage type would result in less difference between 4.x and 5.0. If recovery record size is large enough, 5% and more, the new error correction scheme provides much higher resistance to multiple damages comparing to RAR 4.x recovery record. RAR 5.0 recovery record is based on Reed-Solomon error correction codes. file names and archive comments use UTF-8 encoding. file times are stored as Coordinated Universal Time (UTC) instead of former local time, making file exchange among several time zones more straightforward Though not to same extent as in compression algorithm, it improves the decompression speed on large files with poorly compressible data or when using BLAKE2 checksums. RAR 5.0 decompression can utilize several CPU cores. These excluded algorithms are not efficient for modern data types and hardware configurations RAR 5.0 format includes Intel IA-32 executable and delta compression algorithms, but RAR 4.x text, audio, true color and Itanium algorithms are not supported. If modifiers are not present, megabytes are assumed, so -md64m is equal to -md64 Append 'k', 'm' and 'g' modifiers to specify the size in kilo-, mega- and gigabytes, like -md64m for 64 MB dictionary. md switch syntax is modified to support larger dictionary sizes. You can use -md switch to change this value default dictionary size for RAR 5.0 is 32 MB, typically resulting in higher compression ratio and lower speed than RAR 4.x 4 MB. Both 32 bit and 64 bit versions can unpack archives with any dictionary size, including 1 GB 32 bit RAR version can use up to 256 MB dictionary when creating an archive. maximum compression dictionary size is increased up to 1 GB in 64 bit RAR. By default RAR creates archives in 4.x format.Ĭhanges in RAR 5.0 compression algorithm: You can use -ma command line switch to create RAR 5.0 archives.
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