Preamplifier common-mode noise rejection for two-dimensional magnetic recording

A method for accessing a magnetic storage device, comprising:

• loading a subset of a plurality of magnetoresistive read sensors in a shared-pin array reader for a two-dimensional magnetic recording system with impedance networks to reduce differences in single ended impedance between terminals in the array reader;
• biasing the plurality of magnetoresistive read sensors;
• passing the plurality of magnetoresistive read sensors over a data track on a storage medium;
• and
• amplifying an analog signal from each of the plurality of magnetoresistive read sensors.

A storage system comprising:

• a storage medium;
• a two-dimensional magnetic recording head assembly disposed in relation to the storage medium and comprising a plurality of magnetoresistive read heads sharing a common lead;
• impedance balancing network means for balancing single-ended impedance at each terminal in the two-dimensional magnetic recording head assembly, wherein at least some of the plurality of magnetoresistive read heads are balanced with impedance balancing network means with different impedances;
• and
• means for amplifying signals from each of the plurality of magnetoresistive read heads.