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===Functionality=== Because ext3 aims to be [[Backward compatibility|backward-compatible]] with the earlier ext2, many of the on-disk structures are similar to those of ext2. Consequently, ext3 lacks recent features, such as [[Extent (file systems)|extents]], dynamic allocation of [[inode]]s, and [[block sub-allocation]].<ref>{{cite web | url=http://ext2.sourceforge.net/2005-ols/paper-html/node18.html | title=Extents, Delayed Allocation | first=Rob | last=Radez | year=2005 | work=future of ext3 | access-date=2008-07-30 | archive-date=2008-07-08 | archive-url=https://web.archive.org/web/20080708205131/http://ext2.sourceforge.net/2005-ols/paper-html/node18.html | url-status=dead }}</ref> A directory can have at most 31998 ''subdirectories'', because an inode can have at most 32,000 links (each direct subdirectory increases their parent folder inode link counter in the ".." reference).<ref>Robert Nichols (2007-04-03) [http://linux.derkeiler.com/Newsgroups/comp.os.linux.misc/2007-04/msg00153.html Re: How many sub-directories ?] {{Webarchive|url=https://web.archive.org/web/20081006043647/http://linux.derkeiler.com/Newsgroups/comp.os.linux.misc/2007-04/msg00153.html |date=2008-10-06 }} linux.derkeiler.com</ref> On ext3, like for most current Linux filesystems, the system tool "[[fsck]]" should not be used while the filesystem is mounted for writing.<ref name=":0" /> Attempting to check a filesystem that is already mounted in read/write mode will (very likely) detect inconsistencies in the filesystem metadata. Where filesystem metadata is changing, and fsck applies changes in an attempt to bring the "inconsistent" metadata into a "consistent" state, the attempt to "fix" the inconsistencies will corrupt the filesystem.
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