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Full Discussion: File system mounted or not
Operating Systems Linux Red Hat File system mounted or not Post 302923060 by RudiC on Thursday 30th of October 2014 06:36:12 AM
Old 10-30-2014
A device (a disk, a memory stick, ...) is available to the OS or it's not. Presence is scanned at boot time, or the device may be hot plugged. It will be made available in the /dev directory. Its raw data can be read from there, but, please, don't mess around with raw data. The device can be one single data container, or it can be "partitioned" or "sliced". That means, there are data structures on disk that tell the OS how some regions on disk are to be distinguished from others. Those regions can be seen as "disk" of their own. Up to now, you can't do too much useful things with the device (or "disks") except e.g. put a (large) data stream like a backup on them.
To make data randomly accessible from the OS, you need to create another structure: a file system. There's many an FS in them there hills... *nix type, DOS, windows, MAC, ... FS have tables and pointers and names that allow the OS to manage data chunks called files and make them available to system or users' commands.
Mounting a disk (or file system) reads these logical structures and makes the directories, files, etc... known and accessible to the system, and thus users.
 

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LEARN ABOUT OPENSOLARIS

installboot

installboot(1M) 														   installboot(1M)

NAME

       installboot - install bootblocks in a disk partition

SYNOPSIS

       installboot bootblk raw-disk-device

       The boot(1M) program, ufsboot, is loaded from disk by the bootblock program which resides in the boot area of a disk partition.

       The  ufs  boot objects are platform-dependent, and reside in the /usr/platform/platform-name/lib/fs/ufs directory. The platform name can be
       found using the -i option of uname(1).

       The installboot utility is a SPARC only program. It is not supported on the  architecture.  users should use installgrub(1M) instead.

       bootblk	       The name of the bootblock code.

       raw-disk-device The name of the disk device onto which the bootblock code is to be installed; it must be a character device which is  read-
		       able and writable. Naming conventions for a SCSI or IPI drive are c?t?d?s? and c?d?s? for an IDE drive.

       Example 1: Installing UFS Boot Block

       To install a ufs boot block on slice 0 of target 0 on controller 1 of the platform where the command is being run, use:

	      example# installboot /usr/platform/`uname -i`/lib/fs/ufs/bootblk 
		   /dev/rdsk/c1t0d0s0

       /usr/platform/platform-name/lib/fs/ufs

	   directory where ufs boot objects reside.

       /platform/platform-name/ufsboot

	   second level program to boot from a disk or CD

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

       od(1), uname(1), boot(1M), init(1M), kadb(1M), kernel(1M), monitor(1M), reboot(1M), rpc.bootparamd(1M), init.d(4), attributes(5)

WARNINGS

       The installboot utility fails if the bootblk or openfirmware files do not exist or if the raw disk device is not a character device.

								    11 Apr 2005 						   installboot(1M)
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