1. set up the size you want to create
$vim /boot/grub/menu.lst
set the ramdisk size as 128 MB Add ramdisk_size = 128000 to kernel line
kernel /vmlinuz-2.4.20-20.9 ro root=LABEL=/ hdc=ide-scsi ramdisk_size=128000
$reboot
2. Format the ramdisk
$ mke2fs -m 0 /dev/ram0
3. Create a mount point to mount the ramdisk
$ mkdir /mnt/ramdisk
$ mount /dev/ram0 mnt/ramdisk
More detailed: http://www.vanemery.com/Linux/Ramdisk/ramdisk.html
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