Modular architecture for hard disk drive storage system

A data storage system comprising:

• a main printed circuit board (PCB) comprising at least one system controller circuitry;
• and
• a plurality of stacked hard disk drives (HDDs), each HDD mechanically and electrically connected with the main PCB at or near a longitudinal end of the HDD;
• wherein the system controller circuitry is positioned on the main PCB such that each electrical transmission line length between a respective HDD and the system controller circuitry is substantially equivalent.

A data storage system comprising:

• a main printed circuit board (PCB) comprising at least one system controller circuitry;
• and
• multiple stacked hard disk drives (HDDs), each HDD mechanically and electrically connected with the main PCB at or near a longitudinal end of the HDD, wherein each HDD comprises:
• disk media rotatably mounted on a motor spindle,
• means for storing data by reading from and writing to a disk medium of the disk media,
• means for moving the means for storing to access portions of the disk media, and electronics including a preamplifier, an actuation controller, a motor controller, and sensor circuitry;
• wherein the system controller circuitry is positioned on the main PCB such that each electrical transmission line length between a respective HDD and the system controller circuitry is minimized.