kern/140752: HDD power-off procedure is not clean

Denis dynamic-wind at
Sat Nov 21 11:50:02 UTC 2009

>Number:         140752
>Category:       kern
>Synopsis:       HDD power-off procedure is not clean
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Class:          change-request
>Submitter-Id:   current-users
>Arrival-Date:   Sat Nov 21 11:50:01 UTC 2009
>Originator:     Denis
>Release:        7.2-production
Fujitsu-Siemens S6410 laptop
Hitachi HTS545016B9A300 SATA HDD (Travelstar 5K500.B family) 
After power-down (halt -p) a loud enough "clink" sound is heard from the HDD suggesting it is performing emergency head unload. Such sound is NEVER heard when shutting down WinXP.
I am afraid that this causes excessive stress to a modern HDD.
The specification for Travelstar 5K500.B at$file/TS5K500.B_OEMSpecification_EAmodelRev10.pdf

declares that emergency head unload count is limited to 20,000.
Possibly there is no emergency unload, but the sound is very unpleasant.

P.S. my previous HDD died after 1 year of daily use of FreeBSD-6.3 on the same laptop.


Could ata driver issue Sleep or Standby command at power-down as recommended in the above document?


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