a cache is basically a capasitor for data... the hdd antisipates what the computer is going to need, and caches it.. sometimes its right sometimes its wrong... but for writing, it will use that cache and use it as a buffer..
basically the cache on a hdd does for the system that the ram does for the cpu.. it holds data til the cpu needs it..
so for the most part it does little, while loading a 50MB file... it does little while the hdd is reading the file.. but for something like firefox..
also on slower system bus speeds the cache will hold data while the system is in between loading from the hdd.. maybe its rendering for the cpu...
so is it something to get yes.. but I wouldnt upgrade a hdd just because of the cache.. maybe the capasity or speed
Yes the higher the better. It is used to hold the results of recent reads from the disk so it can pre-fetch that information if it needs to be read in the near future. This reduces the number of times the hard disk platter itself has to be read when you are looking for that information again. Accessing this type of memory in that case is faster than accessing the platter so performance is increased. Hope that helped.
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