http://www.dataram.com/products-and-services/ramdisk

Freeware version (up to 4 GB disk size).

  • Universal version for WindowsXP/2000, Vista (32 and 64-bit) Home Basic, Home Premium, Business and Ultimate, Windows Server 2003 Standard, Web and Enterprise Edition
  • Up to 32 GB disk in Vista and Windows 2003, 2008 Server (paid mode)
  • Save and load features allow RAMDisk to appear as persistent storage even through reboots