RAMDISK is part of system memory which user can use as a normal disk space. The advantage of RAMDISK is faster read and write access in comparison of Hard Disk.
By default Ubuntu mount RAMDISK on /dev/shm/ directory.
To setup RAMDISK on other distributions like Fedora or CentOS, you can follow below method. My machine’s actual RAM size is 2GB out of which I am going to use 512MB for ramdisk.
NOTE : You can also use below method on Ubuntu
mkdir -p /media/ramdisk mount -t tmpfs -o size=512M tmpfs /media/ramdisk/
My name is Vidyadhar Sarmalkar & I work as a consultant and have done RHCE & CCNA. 
