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From: Michael <confabulate@kintzios.com>
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user] Seagate hard drives with dual actuators.
Date: Fri, 15 Nov 2024 09:35:38 +0000	[thread overview]
Message-ID: <2348824.ElGaqSPkdT@rogueboard> (raw)
In-Reply-To: <6b4f83d5-85db-452c-a2da-caca631422ef@youngman.org.uk>

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On Thursday 14 November 2024 22:38:59 GMT Wols Lists wrote:
> On 14/11/2024 20:33, Dale wrote:
> > It's one thing that kinda gets on my nerves about SMR.  It seems,
> > sounds, like they tried to hide it from people to make money.  Thing is,
> > as some learned, they don't do well in a RAID and some other
> > situations.  Heck, they do OK reading but when writing, they can get
> > real slow when writing a lot of data.  Then you have to wait until it
> > gets done redoing things so that it is complete.
> 
> Incidentally, when I looked up HAMR (I didn't know what it was) it's
> touted as making SMR obsolete. I can see why ...

aaaand .... it's gone!  LOL!  Apparently, HDMR is on the cards to replace 
HAMR.


> And dual actuator? I would have thought that would be good for SMR
> drives. Not that I have a clue how they work internally, but I would
> have thought it made sense to have zones and a streaming log-structured
> layout. So when the user is using it, you're filling up the zones, and
> then when the drive has "free time", it takes a full zone that has the
> largest "freed/dead space" and streams it to the current zone, one
> actuator to read and one to write. Indeed, it could possibly do that
> while the drive is being used ...
> 
> Cheers,
> Wol

As I understand it the dual actuator drives are like two separate drives 
placed inside the same casing, but being accessed in parallel by their 
respective head, hence the higher IOPS.  The helium allows thinner platters 
which makes it possible to have higher total storage capacity within the same 
physical size.

The SMR is more complicated in technological terms, with its overlapping 
multilayered recording.  It achieves higher storage density than conventional 
drives, but with lower IOPS on writing operations once their cache is 
exhausted.

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      reply	other threads:[~2024-11-15  9:36 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-11-13 23:10 [gentoo-user] Seagate hard drives with dual actuators Dale
2024-11-14  0:46 ` Matt Jolly
2024-11-14 13:05   ` Dale
2024-11-14  7:55 ` Wols Lists
2024-11-14 16:48   ` Dale
2024-11-15  0:18     ` [OT] " Peter Humphrey
2024-11-15  8:41       ` [gentoo-user] Hollerith (was: Seagate hard drives with dual actuators) karl
2024-11-15  9:51       ` [OT] Re: [gentoo-user] Seagate hard drives with dual actuators Wols Lists
2024-11-14 11:21 ` Michael
2024-11-14 17:00   ` Dale
2024-11-14 19:12     ` Michael
2024-11-14 19:51       ` Frank Steinmetzger
2024-11-14 19:55         ` Frank Steinmetzger
2024-11-14 23:14           ` Peter Humphrey
2024-11-14 20:33       ` Dale
2024-11-14 20:57         ` Rich Freeman
2024-11-14 23:10           ` Dale
2024-11-15  0:59             ` Rich Freeman
2024-11-15  5:53               ` Dale
2024-11-15 10:09                 ` Michael
2024-11-15 11:59                   ` Dale
2024-11-15 15:35                     ` Michael
2024-11-15 16:36                       ` Dale
2024-11-15 22:13                       ` Rich Freeman
2024-11-16 11:02                         ` Michael
2024-11-16 14:36                           ` Rich Freeman
2024-11-16 19:47                             ` Michael
2024-11-16 20:13                               ` Rich Freeman
2024-11-16 23:21                                 ` Wol
2024-11-17 11:22                                 ` Michael
2024-11-17 21:26                                   ` Rich Freeman
2024-11-17 23:04                                     ` Jack
2024-11-18  0:23                                       ` Rich Freeman
2024-11-18  2:32                                         ` Matt Jolly
2024-11-15 10:38                 ` Frank Steinmetzger
2024-11-15 12:19                   ` Dale
2024-11-14 22:38         ` Wols Lists
2024-11-15  9:35           ` Michael [this message]

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