Experimental studies have been carried out on the effects of raw material preparation and hot-pressed conditions on the density, microstructure and magnetic properties of hot-pressed Mn-Zn ferrites and Ni-Zn ferrites which are used for magnetic head application. Hot-pressed ferrites have been prepared by two different technologies: the co-precipitation method and the ball-milling method. It was observed that the co-precipitation method is better than the ball-milling method for preparation of hot-pressed ferrites. The microstructure can be controlled by varying the hot-pressed conditions. Dense ferrites of different grain sizes (average grain size 10 μm-300 μm) can be made. For example, dense Mn-Zn ferrites with μ0 = 7420 and Bm = 4950 Gs and dense Ni-Zn ferrites with different μ0(μ0= 100-2500) can be made by hot-pressing.