[zfs-discuss] Are HGST (Hitachi) Ultrastar and Deskstar the exact same drive?

Durval Menezes durval.menezes at gmail.com
Tue Dec 2 06:08:19 EST 2014


Hi Christ,

On Mon, Dec 1, 2014 at 11:48 PM, Schlacta, Christ <aarcane at aarcane.org>
wrote:

> If anything I'd expect a whole extra platter in the enterprise drive, to
> allow more fec and more spares both. manufacturing wise, that difference
> would be negligible.
>

I expect that to make the disk much more expensive, and/or with less
capacity. Adding an extra platter is no small deal... and I definitely
don't think that's happening on the Ultrastar vs Desktstar, see my last
message.

Cheers,
-- 
   Durval.



>  On Dec 1, 2014 5:46 PM, "Durval Menezes" <durval.menezes at gmail.com>
> wrote:
>
>> Hello Gordan,
>> On Dec 1, 2014 11:43 PM, "Gordan Bobic" <gordan.bobic at gmail.com> wrote:
>> >
>> > On 02/12/2014 01:28, Durval Menezes wrote:
>> >
>> >>  > 3: Greater CRC checking
>> >>
>> >> This is another thing I can't believe in, in this particular case: more
>> >> FEC/ECC (which is what I think you meant by CRC) would consume more
>> disk
>> >> data and leave less available and visible for the end user, and Joe's
>> >> disks have (I think) the same net capacity and the same technology and
>> >> number of platters, which would not leave any space for more
>> FEC/ECC....
>> >
>> >
>> > Or more likely just fewer spare sectors for remapping.
>>
>> On an enterprise disk? I don't think so...
>>
>> Cheers,
>> --
>>    Durval
>> >
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