SuperCache is described as '5 intelligently stores frequently used disk data in system memory. The memory used to store the data is called a cache. SuperCache 5 intercepts requests for disk data and, when possible, fulfills the request using the cache instead of requesting data from the disk' and is an app in the cd/dvd tools category. There are nine alternatives to SuperCache for Windows and Linux. The best SuperCache alternative is PrimoCache. It's not free, so if you're looking for a free alternative, you could try HDDTurbo or m/prefetch. Other great apps like SuperCache are Primo Ramdisk, GiMeSpace RAM Folder Pro, Gavotte Ramdisk and ReadyBoost.
PrimoCache does the same functionality, but its price is reasonable.