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I can give you a few more ideas on the problem (but I don't know if anything of this applies).
The hdd can be perfectly fine but still getting power down/sleep mode commands from the notebook's SATA-controller. If such a command is followed by a power up/wake up command and those are send repreatedly in succession, the hdd doesn't know what to do (park heads, unpark heads, park heads again...).
If you can, try to disable any power saving features that target the hdd in your notebook and see if that heals the problem (remember the fault can be in a driver and or the motherboard SATA-controller as well).
Another reason for a hdd to do this, is an unstable power supply.
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