[zfs-discuss] Are HGST (Hitachi) Ultrastar and Deskstar the exact same drive?
Uncle Stoatwarbler
stoatwblr at gmail.com
Mon Dec 1 19:00:50 EST 2014
On 01/12/14 23:11, Joe Goldthwaite wrote:
> I'll do that once I get them hooked up and I'll let you know.
>
> On Mon, Dec 1, 2014 at 4:07 PM, Durval Menezes <durval.menezes at gmail.com
> <mailto:durval.menezes at gmail.com>> wrote:
>
> Hello Joe,
>
> I would be surprised if there aren't any firmware differences
> between the two. If you can, please post the output of "smartctl -a"
> for each drive.
The "not visible" changes I can think of are likely to be:
1: Better bearings (supported on both ends)
2: Beefier positioning coils (or higher allowed seeking currents. Either
way translates into higher power consumption) to give greater vibration
tolerance.
3: Greater CRC checking
When you look at enterprise vs domestic drive specs the two things that
usually stick out like a sore thumb are that the enterprise units
usually suck a _lot_ more juice and the silent error rate is usually 1-2
orders of magnitude better (1 in 10E15-16 instead of 10E14)
This must be a common question, as Hitachi have a document on the
differences:
http://www.hgst.com/tech/techlib.nsf/techdocs/77F8DE9679CE7E3C8625765C005CC589/$file/Compare_UltrastarDeskstar_TB_final.pdf
It's pretty much as I summarised - plus the ultrastars tend to have more
cache.
looking elsewhere for power usage. it's the difference between 8 and 12
W. Some of that will be the factors above, the other thing not mentioned
is that the Ultrastars are likely to have a more powerful CPU on them to
handle heavier crc loads.
>
> Cheers,
> --
> Durval.
>
> On Dec 1, 2014 8:19 PM, "John Drescher" <drescherjm at gmail.com
> <mailto:drescherjm at gmail.com>> wrote:
>
> > I had ordered the cheaper Deskstar drives for my old ZFS
> array. I ordered
> > three replacement drives last week and they came in today. I
> noticed that
> > one of them was actually an Ultrastar drive.
> >
> > I have both drives side by side and they look *exactly* the
> same. Every
> > specification is identical except for the warranty. The
> Ultrastar has 5
> > years compared to 3 years for the Deskstar.
> >
> > Is this just a marketing gimmick? Do they come of the same
> manufacturing
> > line and HGST just charges more for the extra warranty?
> >
> > I'm just curious if anyone has any inside information on
> this. In the
> > future when they die, I'll probably take them both apart to
> see if I can see
> > any differences in the internals.
>
> Enterprise drives are supposed to have better components and undergo
> more rigorous testing.
>
> John
>
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