What is ext2?

The ext2 or ext2 file system is a file system for the Linux kernel. It was initially made by Rémy Card as a replacement for the extended file technique (ext).
Ext2 is a reasonably modern filesystem that is utilised primarily in Linux environments. It features many of the exact same creature comforts as OS X, including a journal and the capacity to use big files (e.g. bigger than the 4 GB limit in FAT32). This file technique is not natively supported in either OS X or Windows, but free of charge extensions are obtainable for both operating systems that enable fundamentally complete study/create utilization of this filesystem on both OS X and Windows. The Mac OS implementation is accessible at Sourceforge the Windows implementation is offered.
The Second Extended Filesystem (ext2fs) is a rewrite of the original Extended Filesystem and as such, is also based around the concept of “inodes.” Ext2 served as the de facto filesystem of Linux for nearly a decade from the early 1990s to the early 2000s when it was superseded by the journaling file systems ext3 and ReiserFS. It has native support for UNIX ownership / access rights, symbolic- and hard-links, and other properties that are common amongst UNIX-like operating systems. Organizationally, it divides disk space up into groups known as “block groups.” Having these groups outcomes in distribution of data across the disk which helps to reduce head movement as effectively as the impact of fragmentation. Further, some (if not all) groups are needed to contain backups of important information that can be used to rebuild the file technique in the occasion of disaster.
The EXT2 file system, like a lot of the file systems, is built on the premise that the information held in files is kept in information blocks. These information blocks are all of the same length and, although that length can vary amongst different EXT2 file systems the block size of a certain EXT2 file technique is set when it is produced (using mke2fs ). Each file’s size is rounded up to an integral number of blocks. If the block size is 1024 bytes, then a file of 1025 bytes will occupy two 1024 byte blocks. Unfortunately this means that on typical you waste half a block per file. Generally in computing you trade off CPU usage for memory and disk space utilisation. In this case Linux, along with most operating systems, trades off a fairly inefficient disk usage in order to reduce the workload on the CPU. Not all of the blocks in the file program hold data, some need to be employed to contain the information that describes the structure of the file program. EXT2 defines the file method topology by describing each file in the technique with an inode data structure. An inode describes which blocks the information inside a file occupies as well as the access rights of the file, the file’s modification occasions and the type of the file. Every single file in the EXT2 file technique is described by a single inode and every inode has a single exclusive number identifying it. The inodes for the file system are all kept together in inode tables. EXT2 directories are just specific files (themselves described by inodes) which include pointers to the inodes of their directory entries.