Linux Ubuntu under memory virtual hard disk

Memory virtual hard disk command (virtual 2000M HDD)

Free

sudo mkdir/mnt/ramdisk
sudo mount-t tmpfs tmpfs /mnt/ramdisk -o size=2000m

boot automatic memory virtual hard disk
with Fstab

sudo vim/etc/fstab

Add (need to build rda1 folder before media)
tmpfs /mnt/ramdisk tmpfs size=2000m 0 0,ubuntu

so each boot on multiple memory of the hard drive, the effect is equal to win RAMDisk Plus

in fact, Ubuntu itself built a lot of virtual hard disk in the system, such as/DEV/SHM can be used directly.
Enter the DF-AHT command in the terminal to see.
file system capacity has been used with available% mount points
/dev/sda7 reiserfs 2.0G 764M 1.3G 39%/
proc Proc 0 0 0-/proc
/sys SYSFS 0 0 0-/sys
varrun tmpfs 1.1G 201k 1.1G 1%/var/run
varlock tmpfs 1.1G 0 1.1G 0%/var/lock
udev tmpfs 1.1G 119k 1.1G 1%/dev
devshm tmpfs 1.1G 0 1.1G 0%/dev/shm
devpts devpts 0 0 0-/dev/pts
LRM Tmpfs 1.1G 40M 1.1G 4%/lib/modules/2.6.22-14-generic/volatile
/dev/sda10
reiserfs 9.6G 3.4G 6.3G 35% /Home
/dev/sda9 reiserfs 5.1G 3.4G 1.7G 68%/usr
Tmpfs tmpfs 2000M 0 2000M 0% /mnt/ramdisk
SECURITYFS
SECURITYFS 0 0 0-/sys/kernel/security

all marked Tmpfs are virtual hard disks, such as the /mnt/ramdisk I created

Linux Ubuntu under memory virtual hard disk