Ext4支持在线磁盘整理，这能够改善总体*能。
Nanosecond timestamps Most file systems, including ext3, include timestamp data that is accurate to a second. Ext4 extends the accuracy of this data to a nanosecond.
Ext4 has evolved with advancements in file system research, incorporating ideas from other novel file systems (such as the XFS, JFS, Reiser, and the IRON fault-tolerant file system techniques).
特别是Ext4利用日志校验和写屏障来减少由日志或乱序写入磁盘缓存（out-of-orderwritecachingonharddrives）而导致的文件系统数据部一致的概率。
特别是Ext4利用日志校验和写屏障来减少由日志或乱序写入磁盘缓存(out-of- orderwritecachingonharddrives)而导致的文件系统数据部一致的概率。
