Patent ID: 7154692

Claim:
A portable information processing apparatus comprising: a magnetic disk device switchable between a first shock-resistant state in which data access to a magnetic disk by a head is enabled and a second shock-resistant state in which data access to the magnetic disk by the head is disabled where said second shock-resistant state provides increased shock resistance as compared to said first shock-resistant state; at least one first sensor for detecting a first shock-predictive physical quantity, said first shock-predictive physical quantity being a basis for issuing a first prediction that a shock to said magnetic disk device is likely; at least one second sensor for detecting a second shock-predictive physical quantity, said second shock-predictive physical quantity being a basis for issuing a second prediction that a shock to said magnetic disk device is not likely; first prediction means for issuing the first prediction in response to an output from said first sensor; first magnetic disk device switching means for switching said magnetic disk device from the first shock-resistant state to the second shock-resistant state in response to the first prediction; second prediction means for issuing the second prediction in response to an output from said second sensor after said first magnetic disk device switching means switches said magnetic disk device from the first shock-resistant state to the second shock-resistant state; second magnetic disk device switching means for switching said magnetic disk device from the second shock-resistant state to the first shock-resistant state in response to the second prediction; and condition relaxing means for relaxing a condition for issuing the second prediction in response to a delay of a predetermined process in said information processing apparatus caused by the disabled data access due to the second shock-resistant state of said magnetic disk device.