Hamster Free Zip automatically skips and doesn’t archive files with the hidden or system attribute set and also icon shortcuts.PowerArchiver have acknowledged the program crashes if they allow 7z LZMA2 compression to use more than 1 CPU core, so LZMA was used for the Max compression tests.Using ZIP/LZMA is possible which is basically ZIPX, but times were totally unrealistic. PKZIP’s best format is ZIP and was left out of the Max Compression tests. ![]() ALZip’s Max Compression test #1 using EGG was abandoned after 60 minutes as it said completion time was over 5 hours! Other EGG settings produced worse than ZIP compression so were not tested.The Arc Ultra setting wasn’t used as it produced the same file sizes as Maximum but took considerably longer. FreeArc is unable to create ZIP files so was excluded from the ZIP test.It also failed using 7z Ultra LZMA2 in Max Compression test #1, for that one test we had to use Maximum. ![]() UltimateZip has a similar issue to 7-Zip compressing ZIP files at the highest setting.Most archivers using 7-Zip libraries to compress ZIP files have the same problem, including Hamster, WinArchiver, PeaZip and KuaiZip. For the test we had to use a compression level of Normal to finish in a reasonable time. After 15 minutes, longer tests were still under 30% complete. 7-Zip has an issue with the ZIP level set to Ultra and the standard method of Deflate.Extra settings like dictionary or word size were left alone. Deflate64 and other methods are not universally compatible, Windows XP’s built in ZIP being one example which won’t recognize non Deflate ZIPs.įor the Maximum compression tests each archiver was set to the best compression format it had to offer, and then setting its level to maximum, the method was changed if we believed if would improve performance. The compression method was Deflate, this is the standard method for ZIP and the most compatible. Things like dictionary and word size were left at defaults as it would take huge amounts of time to test every single setting. The compression level in the ZIP test was simply set to the highest available in each archiver. Unarchive test #2: Decompress the VMDK file from Archive test #2.Īll 5 tests were run once for ZIP compression and once for Max compression. Unarchive test #1: Decompress all the files from Archive test #1. These are PDF, XLS(X), CSV, DOC(X), TXT and RTF files. It’s a complete mixture of file types and they range in size from a few bytes up to 100MB.Īrchive test #2: A 1.91GB single VMDK virtual image from Microsoft of Windows XP.Īrchive test #3: 129 documents totalling 200MB. The extraction tests were run from one HDD to another.Īrchive test #1: 20,196 files with an overall size of 2.54GB. The operating system is Windows 7 64-bit and 64-bit archiver versions were used if available for download, some others install and run 64-bit versions automatically. WinUHA has not been updated since 2005, UHARC not since 2007.Įach test was run on an Intel Core Quad Q6600 CPU 2.4GHz with 4GB of DDR2 RAM. Development seems to have stopped for StuffIt, KGB Archiver and TUGZip, none have been updated since 2009 or earlier. ![]() FuzeZip and jZip are other archiving tools with issues relating to adware.
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