Minecraft wiki entry for Ramdisk_enabled_server, associated text: Use a Ramdisk utility like Dataram RAMDisk (freeware version available) to create a RAM disk and place the server files on it. Dataram RAMDisk has the option to automatically save an image every time it shuts down and also every few minutes. The free version restricts its maximum disk space to 1G. If larger Ramdisks are required, the Winramtech and the Softperfect Ramdisks seem to offer the best performance with similar features as Dataram RAMDisk.