| 摘要 |
A portable information processing apparatus 10 which is a lap top type has a housing 11 with a hard disk drive 14. At the bottom side 11b of the housing 11, a first touch sensor 20 is provided adjacent a corner 22 and a second touch sensor 21 is provided adjacent a corner 24 which is at a diagonal side. Once the portable information processing apparatus 10 leaves a table, output signals of the respective touch sensors 20 and 21 vary precisely. By comparing the output signals of the respective touch sensors 20 and 21 with a true value table memorized in a memory, it is decided whether the portable information processing apparatus 10 has started dropping. If the portable information processing apparatus 10 starts dropping, the hard disk drive 14 enters the withdrawal mode.
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