In addition to improvements in performance, this version of the file system supports volumes of up to 1EB. ▪Įxt4 Short for Fourth Extended File System. On ext2, if a problem occurred, you would need to run Filesystem Check (fsck) to resolve issues with files and metadata on the system.
#WHAT DOES NTFS STAND FOR FREE#
If the computer crashed, the journal could be used to restore the file system by ensuring that any data that wasn't written to blocks before the crash are resolved so that the blocks are marked as being used when they are actually free (a concept we'll discuss later when we talk about clusters). On ext3, the journal is updated before blocks of data are updated. A journal is similar to transaction logs used in databases, where data is logged before being written. A major improvement to previous versions is that ext3 is a journaled file system, which makes it easier to recover. ▪Įxt3 Stands for Third Extended File System, and supersedes ext2.
#WHAT DOES NTFS STAND FOR HOW TO#
A group of blocks containing information used by the operating system (which can contain such data as how to boot the system) is called a superblock. As we'll see when we discuss clusters later in this chapter, blocks are the smallest unit of data used by the file system, and data is stored to one or more blocks on the HDD. ext2 stores files as blocks of data on the hard disk. This file system implemented a data structure that includes inodes, which store information about files, directories, and other system objects. ▪Įxt2 Stands for Second Extended File System, and offers greater performance and support for up to 2 TB file sizes, and which continues to be a file system used on many Linux machines. Minix was a file system originally used by Linux but was replaced by ext due to shortcomings such as a 14-character limit in naming files, and a 64 MB limitation on partition sizes. It was replaced by ext2 and xiafs, which was based on the older Minix system and is not found in current systems due to its obsolescence.
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It was also the first file system to use the VFS that was added to the Linux kernel. Using VFS, Linux has been able to support a number of file systems, including the following: ▪Įxt The first version of EFS, and the first file system created specifically for Linux. For a file system to work on Linux, it has to conform and provide an interface to VFS so that the upper levels of the operating system can communicate with the file systems used on the machine.
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VFS works as an abstract layer between the kernel and lower-level file systems.
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Linux supports multiple file systems through the use of a virtual file system (VFS).