it is for linux
so script is here..

.
dd if=/dev/zero of=/dev/ram0
count=2000 bs=1024
mke2fs /dev/ram0
mount /dev/ram0 /mnt/
ramdisk
chmod 777 /mnt/ramdisk
if you know about dd command
then you can easily, understand
it.
here you can change count size,
bs (block size) , and mounting
point /mnt/ramdis