Apparatus minimizing impedance in flex-to-printed circuit board connection through the disk base of a hard disk drive

A hard disk drive, comprising:

• a disk base comprising a through connector site;
• a spindle motor mounted on said disk base to rotate at least one disk to create at least one rotating disk surface;
• a head stack assembly pivotably mounted on said disk base comprising
• at least one slider for accessing said rotating disk surface,
• a main flex circuit communicatively coupled to said slider to communicate said access to a flex circuit interface positioned through said connector site,
• said flex circuit interface comprising a flex power plane with a flex impedance patch over said connector site;
• and
• a printed circuit board mounted on said disk base and communicatively coupled to said flex circuit interface, said printed circuit board comprising a printed circuit power plane with a printed circuit impedance path under said connector site.

A head stack assembly for use in a hard disk drive, comprising:

• at least one slider for accessing a rotating disk surface including in said hard disk drive;
• and
• a main flex circuit communicatively coupled to said slider to communicate said access to a flex circuit interface positioned through a connector site in a disk base of said hard disk drive,
• said flex circuit interface comprising at least one member of the group consisting of
• a flex ground plane with at least one flex impedance patch configured to be above said connector site, and
• a flex power plane with at least one of said flex impedance patches configured to be above said connector site.