Shell Programming and Scripting

what is the meaning of root devise????
kernel wants the '/' mounting nd i think it represting the root directory so means directory also work as a storage devise.
nd another thing by changing in every file presenting in fstab file i can change the whole setting of my system?

actually root device is your first ordered (or active or master) device in system.
i can be used it that i meant so "because kernel must mount as rootfs with appropriate labeled "in" correct root device.

However let's belows.

Code:

# df -h '/'
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda2              18G  2.9G   14G  18% /

/dev/sda is your root device..( /dev/ dir is pseudo fs that created by kernel(udev) for attached stroge units)
/dev/sda2 is your root partition device points to its own mount point "/"
/ is your root mount point for access files in root partition. (you can think "/" is like C drive in windows )

regards
ygemici