Portable computer hard disk protective reflex system
AssigneeInternational Business Machines Corporation
InventorLiam D. Comerford
Life of this patent
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Abstract
A protective reflex system for a portab1e computer hard disk initiates protective action before the hard disk suffers the shock of an impact in the event they fall from, for example, a user's lap. A three axis accelerometer is mounted in the portable computer. The output of the accelerometer is continuously monitored by a dedicated processor. In the event of an acceleration event within a preset range of values, the dedicated processor passes a high priority interrupt to the central processing unit of the portable computer and then proceeds to park the disk heads. Alternately, the interrupt routine of the central processing unit may also cause the park operation. In addition to park operation, a brake operation may be performed by either the dedicated processor or the central processing unit.
Claims9
A protective reflex system for a portable computer hard disk which initiates protective action before the hard disk suffers the shock of an impact, said hard disk having at least a one head flying above at least one motor driven rotating disk and said portable computer having a central processing unit, said protective reflex system comprising:
- a three axis accelerometer mounted in the portable computer and generating signals proportional to accelerations along three axes;
- and
- a dedicated processor for continuously monitoring said accelerometer signals and computing an acceleration vector, said dedicated processor further comparing a scaler value of said acceleration vector to a preset range of values close to IG corresponding to a free fall condition and passing a high priority interrupt to the central processing unit of the portable computer when said scaler value falls within said preset range;
- one of said dedicated processor or said central processing unit calling a routine to park said at least one head of the hard disk rapidly before the hard disk suffers the shock of an impact.
A reflective method for protecting a portable computer hard disk by initiating protective action before the hard disk suffers the shock of an impact, said hard disk having at least a one head flying above at least one motor driven rotating disk and said portable computer having a central processing unit and being further provided with a three-axis accelerometer and a dedicated processor, said reflective method comprising the steps of:
- monitoring by said dedicated processor signals from said accelerometer proportional to accelerations along three axes;
- computing by said dedicated processor an acceleration vector and comparing a scaler value of said acceleration vector to a preset range of values close to IG corresponding to a free fall condition and passing a high priority interrupt to the central processing unit of the portable computer when said scaler value exceeds said preset range;
- and
- parking by said dedicated processor or said central processing unit said at least one head of the hard disk rapidly before the hard disk suffers the shock of an impact.
Dependencies are inferred from the claim text.