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AssigneeWestern Digital Corporation
InventorsMarc B. Goldstone, Kenneth D. Donner, Ralph A. Proud, Jr.
Estimating the term…
A disk drive circuit that includes a configuration resistor, a reference resistor, a capacitor and a processor. The processor is mounted on a first circuit assembly in the disk drive, such as the controller circuit board, and the configuration resistor is mounted on a second circuit assembly, such as the head-disk assembly (I-IDA). The resistance of the configuration resistor corresponds to the configuration of the second circuit assembly. The configuration may represent the number of heads or the type of preamplifier in the IDA. The processor calculates the resistance of the configuration resistor to determine the configuration of the second circuit assembly in the following manner. The processor charges the capacitor. The processor then allows the capacitor to discharge through a first circuit that includes both the configuration resistor and the reference resistor and measures the discharge time or time constant. The processor again charges the capacitor. The processor then allows the capacitor to discharge through a second circuit that includes the configuration resistor but not the reference and measures the time constant. The processor calculates the resistance of the configuration resistor in response to the ratio of the time constants of the first and second circuits.
In a disk drive having a first circuit assembly and a second circuit assembly, wherein the first circuit assembly includes a microprocessor and the second assembly has a configuration, a configuration apparatus for indicating the configuration of the second circuit assembly, comprising:
A disk drive including a head-disk assembly (HDA) having at least one data storage disk and a controller assembly having a microprocessor, comprising:
A configuration apparatus in a disk drive, comprising:
In a disk drive having a first circuit assembly, a second circuit assembly and a connector for electrically coupling the first and second circuit assemblies, wherein the first circuit assembly includes a microprocessor, a reference resistor having a predetermined resistance R.sub.r, and a capacitor, and wherein the second circuit assembly has one of a plurality of predetermined disk drive configurations and includes a configuration resistor having a resistance R.sub.s corresponding to the configuration of the second circuit assembly, a method for detecting the configuration of the second circuit assembly, comprising the steps of:
Dependencies are inferred from the claim text.