Western Digital Red?

Yousuf Khan wrote:

So 5000's would have the same amount of data/inch as 7200's.

For the same generation of drives, yes. Over time, the "areal density"
of hard drives has increased, so the same amount of data can be read or
written with fewer head movements (seeks) and platter rotations
(latency). That means a higher density drive will, on average, perform
better than a lower density drive of the same rotational (spindle)
speed, even without improvements in caching.

Note that there are two flavors of WD Red drives: a base version that
runs at 5400rpm and a Pro (higher priced) version that spins at 7200rpm.
So far, I'm very happy with the standard Reds in my RAID box.

"Yousuf Khan" wrote in message
...
On 11/24/2016 4:35 AM, mike wrote:
On 11/23/2016 7:32 PM, Yousuf Khan wrote:
Yes, I noticed that it's a slower-speed drive. Does it really make a
huge difference that a drive is either 5400/5900 RPM these days with
64MB caches onboard?

Yousuf Khan

A few years back, I updated a laptop from 5400 to 7200RPM.
Made a significant difference in how fast it "felt".

True, but I've also recently noticed that some newer 7200's feel a lot
faster than older 7200's, without any change in rotational speeds.

Want matters is the speed the sectors pass under the heads.
Bet the difference is just due to more sectors per track.

I'm assuming it's due disk caching.

Unlikely.

So given identical disk caching, will a 5900 feel pretty fast too?

Unlikely.

On Thursday, November 24, 2016 at 7:05:40 AM UTC+8, Percival P. Cassidy wrote:

1. Drives designed for NAS use *may* run at a lower speed, e.g.,
5400/5900rpm rather than 7200rpm. They probably run a little cooler this
way. I think this is true of WD Red drives.

2. They may be designed to minimize rotational and other vibration that
could affect other drives in the same enclosure.

As with any brand, some people love the Reds for NAS use, but I just
read a post on the FreeNAS forum by someone who will never buy another Red.


Apart from that, red drives are designed for RAID. So they handle errors
differently from blue drives.