Flexible printed circuit to suspension soldering improvement

A hard disk drive flexible printed circuit (FPC) comprising:

• a plurality of fingers extending from a root to a tip, each finger comprising:
• a first conductive trace layer positioned on a first side of a base layer and comprising a particular plurality of electrical pads extending to a lateral edge, and
• a second conductive trace layer positioned on an opposing second side of the base layer and adhered with an adhesive layer to a cover film,
• wherein particular traces of the second conductive trace layer electrically connected to the particular plurality of electrical pads are configured such that the adhesive layer between the particular traces is wider than each particular trace to expose evaporative surface area of the adhesive layer.

A hard disk drive (HDD) comprising:

• a plurality of recording media rotatably mounted on a spindle;
• a plurality of head sliders each housing a respective read-write transducer configured to read from and to write to at least one recording medium of the plurality of recording media;
• means for moving the plurality of head sliders to access portions of the recording media;
• and
• a flexible printed circuit (FPC) configured to transmit electrical signals to and from the plurality of head sliders, the FPC comprising a plurality of fingers extending from a root to a tip, each finger comprising:
• a first conductive trace layer positioned on a first side of a base layer and comprising a particular plurality of electrical pads extending to a lateral edge, and
• a second conductive trace layer positioned on an opposing second side of the base layer and adhered with an adhesive layer to a cover film, including means for inhibiting bubbling of the adhesive layer in response to heating of the particular plurality of electrical pads.