On 13/12/2017 17:47, Rodney W. Grimes wrote:
On Tue, 12 Dec 2017 14:58:28 -0800
Cy Schubert <cy.schub...@komquats.com> wrote:
I think people responding to my thread made it clear that the WD Green
isn't the first-choice-solution for a 20/6 (not 24/7) duty drive and
the fact, that they have serviced now more than 25000 hours, it would
be wise to replace them with alternatives.


I think someone had an apm command that turns off the head park,
that would do wonders for drive life.   On the other hand, I think
if it was my data and I saw that the drive had 2M head load cycles
I would be looking to get out of that driv with any data I could
not easily replace.  If it was well backed up or easily replaced
my worries would be less.

WD made their first series of Green disks green by aggressively turning them into sleep state. Like when few secs there was nog activity they would park the head, spin it down, and sleep the disk...
Access would need to undo the whole series of command.

This could be reset by writing in one of the disks registers. I remember doing that for my 1,5G WDs (WD15EADS from 2009). That saved a lot of startups. I still have 'm around, but only use them for things that are not valuable at all. Some have died over time, but about half of them still seem to work without much trouble.

WD used to have a .exe program to actually do this. But that did not
work on later disks. And turning things of on those disks was impossible/a lot more complex.

This type of disk worked quite a long time in my ZFS setup. Like a few years, but I turned parking of as soon as there was a lot of turmoil about this in the community. Now I using WD reds for small ZFS systems, and WD red Pro for large private storage servers. Professional server get HGST He disks, a bit more expensive, but very little fallout.

--WjW
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