Method and Apparatus for Reading and Storing Data in Channels on a Hard Disk Drive
Original Publication Date: 2001-Aug-01
Included in the Prior Art Database: 2003-Jun-20
Disclosed is a method for increasing the volume of the bit cell in a synthetic spin filter or spin valve magnetic medium of a hard disk drive. The method records and reads data perpendicular from the drive surface, positioning multiple fixed GMR heads in channels in the drive surface. Current hard disk drives use a movable drive head assembly that reads and writes data at the horizontal surface of the drive medium. As current bit cell sizes decrease with increasing density, there is a risk of the bit cell's becoming thermally unstable and thus causing degradation of data. Thus, there is a real limit to density of bit cells in a horizontal surface. The proposed method carves parallel channels in the surface of the medium, and places a head-drive assembly in each channel. Each drive assembly houses multiple GMR drive heads to read each side of the channel and the bottom of the channel. Figure 1 shows the arrangement schematically. FIGURE 1.