But they cost money to add a detector and difficulty for the installation of the sensor into the area so that the dielectric is a Pur-powered small read/write head of the hard disk drive because it is small.
But the cost of adding sensors and difficult to install a sensor into the area of piezo electric-driven compact read / write heads of hard disk drives because they are small.
But the cost of adding sensors and difficult for installation into the area sensor piezoelectric driven small of the read / write head of hard disk drive due to small.