AC Bias Read Write Driver
Original Publication Date: 1981-Feb-01
Included in the Prior Art Database: 2005-Feb-10
A buried servo disk file is a moving head magnetic disk storage system in which the position of the head is controlled by a prerecorded servo signal that resides in the same portion of the recording medium as the stored data. For continuous servoing from such recorded servo information, using only one head, the head write and read electronics must make it possible to read back the servo information not only while reading data but also while writing data. To make servo reading possible while writing data, the write driver should present a high output impedance to the head, i.e., the write driver should drive the head with a current rather than a voltage.