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PostPosted: Wed Nov 07, 2012 7:30 pm 
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Joined: Sun Apr 06, 2008 10:26 am
Posts: 432
Location: UK
I know the importance of back up, so will install a drive to do that!!
Many thanks for the heads-up

John :D

Nikon D7100, Nikon D80, D40 and various lenses.

PostPosted: Thu Jul 04, 2013 12:23 pm 
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Joined: Sat Sep 30, 2006 4:30 pm
Posts: 9886
Location: UK
Hi folks,

Has your computer ever become unresponsive, sometimes for as long as a second or two?

While doing my homework designing a new PC I came across the subject of "max latency", particularly as it relates to SSDs. The nature of SSDs demands that the controller has to do a deal of housekeeping to keep performance at a reasonable level. Here's a graph of maximum write latency for a number of drives:


It is from this review of the Samsung SM843 Enterprise SSD over at and I urge you to follow the link, not only to support the site but also to get the full background. My current Samsung PB22-J 256GB drive is four years old, a strong unit in its day but I have my suspicions that its max latency is up there with the worst of the drives in the graph above!

The max latency of some of the first generation SSDs is pretty shocking but even today's gold standard consumer drive, the Samsung 840 Pro, can occasionally post a 3/4 second latency if you catch it at a bad moment! :shock: If you look at the average write latency then things seem a lot rosier:


These are the sort of numbers you see on the typical sales blurb and, comparing the two charts, one can see that they can hide a significant issue. It might come as no surprise to know that I am strongly considering the Intel DC S3700 for my next build. It's horribly expensive and it doesn't necessarily offer the best read throughput but it performs consistently and as I expect the new machine to still be in use ten years from now (CPU performance has plateau-ed IMHO) I can amortise the cost over that period and still be confident that the drive is well inside its design life and performing strongly.


Sony RX1R II. Olympus OM-D E-M1 + M.Zuiko Digital ED 12-40mm f/2.8, M.Zuiko Digital ED 40-150mm f/2.8 + 1.4x T/C, Lumix 7-14mm f/4, Leica DG Summilux 15mm f/1.7 ASPH, M.Zuiko Digital 45mm 1:1.8
M.Zuiko Digital ED 75mm 1:1.8, Leica D Vario-Elmar 14mm-150mm f/3.5 - f/5.6 ASPH.
OM-D E-M5, H-PS14042E, Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.

PostPosted: Wed Dec 18, 2013 6:00 pm 

Joined: Wed Dec 18, 2013 5:36 pm
Posts: 17
Thanks soo much for the above post,
always thought it was a little bit more complicated than the manufacturers stats, and just the read/write amounts.

Any where i can look now for the latest and greatest, in the terms used above??
Oh and anyone recommend any builders in the UK that would trust using components tested like those above?
I can build my own, but id rather have the protection of someone else doing it now.

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