The initial versions removed some NTFS features, such as disk quotas, alternate data streams, and extended attributes. Some of these were re-implemented in later versions of ReFS. In early versions (2012–2013), ReFS was similar to or slightly faster than NTFS in most tests, but far slower when full integrity checking was enabled, a result attributed to the relative newness of ReFS.
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The ability to create ReFS volumes was removed in Windows 10's 2017 Fall Creators Update for all editions except Enterprise and Pro for Workstations. The cluster size of a ReFS volume is either 4 KB or 64 KB. 6 Performance and competitor comparisonsįeature changes compared to NTFS Major new features Improved reliability for on-disk structures ReFS uses B+ trees for all on-disk structures, including all metadata and file data.Microsoft Windows and Windows Server include ReFSUtil, a command-line utility that can be used to diagnose heavily damaged ReFS volumes, identify remaining files, and copy those files to another volume. Metadata and file data are organized into tables similar to a relational database. The file size, number of files in a folder, total volume size and number of folders in a volume are limited by 64-bit numbers as a result, ReFS supports a maximum file size of 16 exbibytes (2 64−1 bytes), and a maximum volume size of 35 petabytes. Built-in resilience ReFS employs an allocation-on-write update strategy for metadata, which allocates new chunks for every update transaction and uses large IO batches. All ReFS metadata have 64-bit checksums which are stored independently. The file data can have an optional checksum in a separate "integrity stream", in which case the file update strategy also implements allocation-on-write for file data this is controlled by a new "integrity" attribute applicable to both files and directories.
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