ext4 file system

ext4 file system

Ext4 is an advanced form of filesytem which is not currently available widely on all operating systems. But still the files with ext4 filesytem can be opened as read only on macintosh and might be on windows. Ext4 comes up with the backward compatibility. But one of its features is delayed allocation, to avoid fragmentation, causes some additional risk of data loss in cases where the system crashes or loses power before all of the data has been written to disk. Ext4 provides timestamps measured in nanoseconds in which 2 bits of the expanded timestamp field are added to the most significant bits of the seconds field of the timestamps to defer the year 2038 problem for an additional 204 years. According to wikipedia, Google preferred to adopt this filesystem for android 2.3 instead of YAFF, which shows its improved image in technological advancement.