@ Dagnachew, Swami, Steve:

I've noticed that in Dagnachew's output the power management has changed
to 1 while his acoustic management setting is 128 after changing
etc/hdparm.conf.

My disk is still spinning down after adding apm_battery=128.

Can it be that some disks interpret a power management setting
mistakenly as acoustic management or both?

My current, abridged hdparm -I:

...
Capabilities:
        LBA, IORDY(can be disabled)
        Queue depth: 32
        Standby timer values: spec'd by Standard, no device specific minimum
        R/W multiple sector transfer: Max = 16  Current = 16
        Advanced power management level: 128
        Recommended acoustic management value: 254, current value: 0
        DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 udma5 *udma6 
             Cycle time: min=120ns recommended=120ns
        PIO: pio0 pio1 pio2 pio3 pio4 
             Cycle time: no flow control=120ns  IORDY flow control=120ns
...

Any ideas?

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https://bugs.launchpad.net/bugs/952556

Title:
  [Precise] [Hardware-killer] HD restarts every few seconds

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