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Operating-Systems-10CS53-unit-8-->View question


Asked On2017-05-15 21:59:37 by:pallaviaithaln

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The Extended File System, ext, was introduced in April, 1992. With a maximum partition size of 2GB and a maximum file name size of 255 characters, it removed the two biggest minix limitations. However, there still was no support for the separate access, inode modification and data modification time stamps. Also, its use of linked lists to keep track of free blocks and inodes caused the lists to become unsorted and the file system to become fragmented.

The Second Extended File System (ext2) was released in January, 1993. It was a rewrite of ext which features (1) improved algorithms that greatly improved its speed, (2) additional date stamps (such as date of last access, date of last inode modification and date of last data modification) and (3) the ability to track the state of the file system. Ext2 maintains a special field in the superblock that indicates the status of the file system as either clean or dirty.A dirty filesystem will trigger a utility to scan the file system for errors. Ext2 also features support for a maximum file size of 4TB (1 terabyte is 1024 gigabytes). Consequently, it has completely superseded ext, support for which has been removed from the Linux kernel.

Ext2 is the most portable of the native Linux file systems because drivers and other tools exist that allow accessing ext2 data from a number of other operating systems. However, as useful as these tools are, most of them have limitations, such as being access utilities rather than true drivers, not working with the most recent versions of ext2, not being able to write to ext2 or posing a risk of causing file system corruption when writing to ext2.


Answerd on:2016-02-13 Answerd By:scribed

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