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ext3, or third extended filesystem, is a journaled file system that is commonly used by the Linux kernel. ext3, or third extended filesystem, is a journaled file system that is commonly used by the Linux kernel.
ext3 adds the following features to ext2:
A journal
Online file system growth
HTree indexing for larger directories
Max. volume size: 4 TiB – 32 TiB
Max. file size: 16 GiB – 2 TiB
Max. filename length: 255 bytes
https://en.wikipedia.org/wiki/Ext3