On Mon, 05 Sep 2011 14:25:46 -0400
Steve <[email protected]> wrote:

> For the fun of it, I just installed 4.9 (AMD64) on an SD card, booted 
> from the card and mounted one of my Ext3 partitions on the hard disk.
> I copied a file from  the disk to the card to be sure it was active, 
> umounted the hard disk and halted. Not a sound from the disk.... no 
> click, nothing.

for testing, use -current/snapshots.


http://marc.info/?l=openbsd-cvs&m=127460880427991&w=2
"""
Changes by:     [email protected]        2010/05/23 03:58:58

Modified files:
        sys/dev/ata    : wd.c 

Log message:
Place drive in standby mode before shutdown.  Avoids the loud click
heard on many laptops when powering them down.
"""

That went into 4.8, the oldest supported OpenBSD version.
"Hail to the kettenis@, baby!"

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