Thin-film magnetic head with through holes reaching medium-opposed surface

A magnetic tape apparatus comprising:

• at least one magnetic tape;
• at least two reels for feeding and/or winding said at least one magnetic tape;
• at least one thin-film magnetic head for reading data from said at least one magnetic tape and/or writing data to said at least one magnetic tape;
• and
• a recording and/or reproducing control circuit for controlling read and/or write operation performed by said at least one thin-film magnetic head, the thin-film magnetic head comprising:
• at least one magnetic head element for reading and/or writing data, formed on/above an element formation surface of a substrate;
• an overcoat layer formed on said element formation surface so as to cover said at least one magnetic head element;
• a closure adhered to at least a portion of an upper surface of said overcoat layer;
• at least one through hole reaching a sliding surface opposed to the magnetic tape of the thin-film magnetic head, for adjusting a pressure working between the thin-film magnetic head and the magnetic tape;
• and
• at least one flow-amount control means for controlling the flow amount of gas that flows via said at least one through hole, and
• said magnetic tape apparatus further comprising a pressure control circuit for controlling operations of said at least one flow-amount control means.