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Spindle motor current logging for Hard Disk Interference precaution Disclosure Number: IPCOM000013931D
Original Publication Date: 2000-May-01
Included in the Prior Art Database: 2003-Jun-19

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Disclosed is a precaution method for Head Disk Interference (HDI) of Hard Disk Drive (HDD) by detecting the increase of Spindle driver current. If the head cannot fly on the disk correctly, HDI is happened. HDI causes Disk and Head damage and finally read/write operation cannot be done. This means user data is destroyed. In other words, user data can be kept if the prediction of HDI is taken. Spindle motor current (Imtr) is good to predict the HDI, because Imtr is increased by the friction increase between Head and Disk. Usually Spindle motor current can be monitored by MPU. So HDI condition can be detected while Imtr is monitored promptly. Following sequence is one of example to achieve this function. 1. Monitor the Imtr when an read or write error is happened. 2. Check the logging value and Warn a HDI precaution message to the PC if the logging value shows higher than the criteria. 3. Save the Imtr value into Disk logging area for the failure analysis purpose.