![]() ![]() P32P4911A, Philips, PRML Read Channel with PR4, ENDEC, Servo:Ī data recovery company will not replace the motor. L6327, L6332, ST Microelectronics, 6 / 4 CHANNEL VOLTAGE SENSE GMR PREAMPLIFIER, +5V, -5V: L7250, SMOOTH, spindle motor + VCM controller, ST Microelectronics: ![]() The following article should give you some insight into the drive's working parts:įYI, the following datasheets will give you the nitty gritty information about the functions of a typical SMOOTH motor controller, a GMR head preamplifier, and a read channel. I suspect that in those cases the problem may be in the read channel logic. That said, certain HDD models (eg WD's Tornado family) suffer from MCU faults whose symptoms mimic head or media faults. Sometimes the drive will hang or spin down. I don't know for certain what causes the pauses and stutters in HDD operation, but I believe it is due to the drive retrying "difficult" sectors. This results in reduced signal amplitude which can manifest itself as a media fault. ![]() That is, when the head slaps the platter, or encounters a contaminant particle, it heats up to a very high temperature, causing its magnetoresistive materials to permanently degrade. The typical cause is a degradation of magnetic characteristics as a consequence of thermal asperities. AIUI, modern high capacity drives often suffer from weak heads.
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