A Ground Loop Read Line Shield Using the Write Lines in a Disk File Recording Channel
Original Publication Date: 1989-Jan-01
Included in the Prior Art Database: 2005-Jan-29
In a disk file the interconnection between the read element and the associated read circuitry is a source of noise in the read signal. Prior disk files have used a twisted pair of fine wires for this interconnection. Use of wire is expensive in material cost and in the labor required to make the assembly. Recent designs for this interconnection have employed various flat cable technologies. Where the recording scheme features separate write and read elements, the interconnection will have at least 6 lines, 2 for write, 2 for read and 2 for read shielding. The invention described herein consists of using the write leads for the read shield function, as shown in the figure. This is possible because the read and write functions are mutually exclusive.