文档介绍：硬盘异响维修(Hard knock maintenance)
r m here to talk about simple working principle of hard disk: disk power spindle motor s that the hard disk failure occurs on the hardware.
The next step is fault inspection and analysis of the hard disk, why from time to time, "KaKa" sound, computer can not recognize the hard drive to?
First, I check the circuit board of the chip, a failure occurs, I try to use a hand (first release static) touch the hard disk circuit on chip, the chip is not hot, and sometimes is the normal boot can read and write on the hard disk, the chip should be normal, so it can not think because the chip problem that the hard disk failure.
As we all know, when the hard work needs a stable voltage and current enough, if the voltage is not stable or current is insufficient, spindle motor operation will be affected, thus making the magnetic arm tracking difficult, that is to say if the hard drive power supply voltage or current change is too large, it will cause the hard drive speed change, then it will magnetic arm positioning error caused by non normal or, read data or hard disk damage increase. The hard disk often issued "KaKa" sound is probably because the current instability and make the hard disk and abnormal magnetic arm produced by continuous positioning.
Since it is not because the chip problem that the hard drive failure, it may be because of the unstable volt