mkfs   –  creating filesystem – is used to build a Linux file system on a device, usually a hard disk partition. filesys is either the device name (e.g. /dev/hda1/dev/sdb2) or the mount point (e.g. //usr/home) for the file system.blocks is the number of blocks to be used for the file system.


mkfs utility is used to create filesystem (ext2, ext3, ext4, etc) on your Linux system. You should specify the device name to mkfs on which the filesystem to be created.

WARNING: Executing these commands will destroy all the data on your filesystem. So, try these commands only on a test system where you don’t care about losing your data.


mkfs -t reiserf /dev/hda5


Produce verbose output, including all file system-specific commands that are executed. Specifying this option more than once inhibits execution of any file system-specific commands. This is really only useful for testing.
-t fstype
Specifies the type of file system to be built. If not specified, the default file system type (currently ext2) is used.
File system-specific options to be passed to the real file system builder. Although not guaranteed, the following options are supported by most file system builders.
Check the device for bad blocks before building the file system.
-l filename
Read the bad blocks list from filename
Produce verbose output.