The mechanical texturing process is that which is utilized to generate circumferential texture patterns on the NiP surface using a pliable tape while supplying a lubricant and diamond slurry. We investigate the texture surface roughness, texture parameter delta/lambda, texture scratch defects, orientation ratio (OR) and signal to noise ratio (SNR) performances of disks prepared by three combinations of thermally heat-treated diamond (THT) and ultra-dispersed diamond (UDD) with coolants labeled A1 and M1. Experimental results show that the substrates textured with UDD/M1 slurry can create a disk surface with the highest parameter delta/lambda, which results in the highest OR and SNR, as compared to substrates textured with THT/A1 and THT/M1 slurries. By increasing the texture coolant concentration from 5 to 25%, the zeta potential, diamond size, texture roughness, texture scratch pixel count, parameter delta/lambda, OR and SNR increase dramatically. The UDD diamond and 10 wt% M1 coolant showed the best performance with respect to lower surface finish (Ra), lower scratches and higher SNR. (C) 2007 Elsevier B.V. All rights reserved.