what is the difference between ext2 and ext3?
Linux
1、ext2 used to be the most common Linux filesystem
2、ext3 is based on ext2
3、Same on-disk structure
4、ext2 can be converted to ext3
5、ext3 can be mounted as an ext2 file system
6、ext3 is a journaling filesystem，Preserves data integrity better than ext2，Faster and safer fsck after system crash
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