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Re: [OM] Back in the fold [was On the Road Again]

Subject: Re: [OM] Back in the fold [was On the Road Again]
From: Bob Whitmire <bwhitmire@xxxxxxxxxxxxxx>
Date: Wed, 3 Apr 2013 12:25:58 -0400
Gracias, amigo.

Much help. The SD card is key. It's the first card the camera writes to. 
Sometimes I spill over, but not often.

--Bob


On Mar 31, 2013, at 5:02 PM, Moose wrote:

> On 3/31/2013 6:48 AM, Bob Whitmire wrote:
>> I'm in the market for some fast SD cards, as the D800 files are somewhat 
>> hefty and the standard issue SD or CF takes a bit of time to write.
> 
> It can be a bit confusing. (I'm only up to date on SD, so you are on your own 
> for CF.)
> 
> First, we had all the 'X' speed designations, which obviously were not 
> standardized, and in some cases seemed to have 
> been designated by marketing.
> 
> Then we had 'class x' ratings, which are much more meaningful, but have 
> peaked at Class 10.
> 
> UHS* is actually a different interface protocol**, and requires that the 
> camera understand it. Your D800 can do UHS-1. 
> UHS-2 exists as a spec. Wikipedia says no cards exist as yet and I doubt any 
> cameras yet support it.
> 
> (There's an in between mode, called UHS104, which supports twice the clock 
> freq. and transfer speed. Sandisk, at least, 
> has cards with rated write speed of 90MB/s which means they must have this. 
> But what devices may be able to use it, I 
> have no idea. Sounds like something to gull us into paying for capability our 
> cameras can't use.)
> 
> But for you, and me, it's UHS-1.
> 
> I came to try them when B&H had a closeout sale of Sonys, two 32 GB cards for 
> $35. They claim a write speed of 45Mbps, 
> 4.5 times the Class 10 spec and near the theoretical 50 max. of the spec.
> 
> NOTE: The speeds on the card labels are meaningless for camera use. They are 
> read speeds***, not write speeds. A card 
> like the Sandisk Extreme 8GB card sitting in front of me is a Class 10 that 
> says "30MB/s" on the front. But that's the 
> read speed; write is 10MB/s.
> 
> The Sonys I just got do the same thing, touting 94MB/s on the label. Both 
> brands have an asterisk on the MB/s label 
> number, but no footnote on the card.
> 
> Ultra Something Moose
> 
> * Ultra High Speed, duh.
> 
> ** Sounds to me like some sort of return from serial to parallel, with a 
> "four-bit transfer mode" per clock cycle.
> 
> *** And indeed, even though not UHS-1, the reader I installed in my computer 
> does seem faster with the cards with faster 
> read ratings.

-- 
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