Magnetic disk drive having a suspension mounted transmission line including read and write conductors and a lower conductor

A magnetic disk drive comprising:

• a suspension;
• a magnetic head coupled with the suspension and configured to write and read information to and from a magnetic recording medium;
• and
• a transmission line disposed on the suspension to transmit writing and reading information to and from the magnetic head, the transmission line including a writing line and a reading line, a lower conductor disposed underneath the writing line and the reading line, and a first insulating layer interposed between the lower conductor and the writing and reading lines,
• wherein the lower conductor has a stainless steel layer as a flexure formed thereunder integrally with the suspension,
• wherein a second insulating layer is interposed between the lower conductor and the stainless steel layer,
• wherein the suspension, the weld point, the stainless steel layer, and the lower conductor are grounded.

A magnetic disk drive comprising:

• a suspension;
• a magnetic head coupled with the suspension and configured to write and read information to and from a magnetic recording medium;
• and
• a transmission line disposed on the suspension to transmit writing and reading information to and from the magnetic head, the transmission line including a writing line and a reading line, a lower conductor disposed underneath the writing line and the reading line, and a first insulating layer interposed between the lower conductor and the writing and reading lines, wherein the lower conductor comprises copper or copper-based alloy;
• wherein a stainless steel layer which is disposed under the lower conductor and coupled with the suspension,
• wherein a second insulating layer is interposed between the lower conductor and the stainless steel layer,
• wherein the suspension, the stainless steel layer, and the lower conductor are grounded.