This link added some other information like number of subdirectorys in a single
directory.
http://www.linux-mag.com/2002-10/jfs_04.html

<quote>
The downside of Ext3? It's an add-on to Ext2, so it still has the same
limitations that Ext2 has. The fixed internal structures of Ext2 are simply too
small (too few bits) to capture large file sizes, extremely large partition
sizes, and enormous numbers of files in a single directory. Moreover, the
bookkeeping techniques of Ext2, such as its linked-list directory
implementation, do not scale well to large file systems (there is an upper
limit of 32,768 subdirectories in a single directory, and a "soft" upper limit
of 10,000-15,000 files in a single directory.) To make radical improvements to
Ext2, you'd have to make radical changes. Radical change was not the intent of
Ext3.
</quote>

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