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73416ba
(Get the code!)
It looks like WD BEVT-series was not mentioned here and the kernel.org is still down.
I just noticed huge Load_Cycle_Count on the WD1600BEVT-80A23T0. It almost reached 300 000 when I stopped it (299 252 to be precise) with
hdparm -B 255 /dev/sda
-B 254 didn't help, it just _ignored_ it.
Power_On_Hours is 2771 and that gives an average of 107 cycles per hour. Which is still very small compared to what I've heard today: it parks every 3-6 seconds (!) on the battery.
I didn't read all the comments (there is way too much of them) so if there was a better fix then disabling APM at all, please inform me.
FYI: it's an Asus T101MT notebook.