| 摘要 |
A hard disk drive (HDD) for detecting and reading a signal written on a hard disk using a head. The hard disk drive includes: a plurality of head disk assemblies each having at least one controller, a plurality of disks for storing magnetized data and a plurality of heads for writing and reading data to and from the disks; a main printed circuit board physically being separated from each head disk assembly, for controlling reading/writing of data by the heads; and connectors for electrically connecting the main printed circuit board with each head disk assembly, wherein the main printed circuit board includes a setting unit for setting information about the disks and heads contained in each head disk assembly, and a switch unit for selecting a disk and a head of one head disk assembly according to the information set by the setting unit and assessing the selected disk and head via the corresponding connector when intended to access a predetermined disk and head of one of the head disk assemblies. The hard disk drive can do reading/writing operation by connecting a plurality of HDAs to one main PCB, so that disk storage capacity can be varied.
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