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Firstly, do they smoke copious amounts of crack at SanDisk HQ? What is
it with their ridiculous branding and re-branding of their product
range? I finally managed to work it all out. One thing I've not really
understood yet is the correlation between Speed Class Rating and the
speed specified on the card. For example you can get a Class 6 card
that claims to be 30 MB/s. Doesn't Class 6 just mean it can handle a
minimum write speed of 6 MB/s ? So where does the 30 MB/s come from?
And if the Class is no real indicator of responsiveness is there any
point buying a Class 6 card over a Class 10 card when all else is equal?
(both state 8GB and 30 MB/s).

On 05/10/2010 15:28, Shanks wrote:
> Firstly, do they smoke copious amounts of crack at SanDisk HQ? What is
> it with their ridiculous branding and re-branding of their product
> range? I finally managed to work it all out. One thing I've not really
> understood yet is the correlation between Speed Class Rating and the
> speed specified on the card. For example you can get a Class 6 card
> that claims to be 30 MB/s. Doesn't Class 6 just mean it can handle a
> minimum write speed of 6 MB/s ? So where does the 30 MB/s come from?
> And if the Class is no real indicator of responsiveness is there any
> point buying a Class 6 card over a Class 10 card when all else is equal?
> (both state 8GB and 30 MB/s).

The "class" doesn't seem related to a specific speed. See:

http://www.sdcard.org/developers/tech/speed_class/

where they carefully avoid giving any speed figures.

--
Bertrand

In article <i8f964$jh1$>,
says...
>
> Firstly, do they smoke copious amounts of crack at SanDisk HQ? What is
> it with their ridiculous branding and re-branding of their product
> range? I finally managed to work it all out. One thing I've not really
> understood yet is the correlation between Speed Class Rating and the
> speed specified on the card. For example you can get a Class 6 card
> that claims to be 30 MB/s. Doesn't Class 6 just mean it can handle a
> minimum write speed of 6 MB/s ? So where does the 30 MB/s come from?
> And if the Class is no real indicator of responsiveness is there any
> point buying a Class 6 card over a Class 10 card when all else is equal?
> (both state 8GB and 30 MB/s).

Buy any class that is equal to or higher than that specified by the
device you're plugging it into.

On 05/10/2010 15:48, J. Clarke wrote:
> In article <i8f964$jh1$>,
> says...
>>
>> Firstly, do they smoke copious amounts of crack at SanDisk HQ? What is
>> it with their ridiculous branding and re-branding of their product
>> range? I finally managed to work it all out. One thing I've not really
>> understood yet is the correlation between Speed Class Rating and the
>> speed specified on the card. For example you can get a Class 6 card
>> that claims to be 30 MB/s. Doesn't Class 6 just mean it can handle a
>> minimum write speed of 6 MB/s ? So where does the 30 MB/s come from?
>> And if the Class is no real indicator of responsiveness is there any
>> point buying a Class 6 card over a Class 10 card when all else is equal?
>> (both state 8GB and 30 MB/s).
>
> Buy any class that is equal to or higher than that specified by the
> device you're plugging it into.
>
>

Well my main concern is shooting in continuous mode in raw on my D90. I
don't think the D90 can utilise class 10. And I read the pics in using
the SD Card reader on my Mac Book Pro (mid 2010 model) and I'm not sure
what class that can handle...? Wonder where the bottleneck would be..?

* Shanks wrote
> I'm not sure
> what class that can handle...? Wonder where the bottleneck would be..?

Erm, sorry about replying to my own post. A quick google reveals:

"What is the maximum speed that my computer can use when reading and
writing to an SD card in the SD card slot?

Your Macintosh has a maximum speed of 240 Mbit/s for SD media using the
SD card slot. This exceeds the transfer rate of most SD media. Check
the packaging that came with your SD media to determine the maximum
transfer rate used by that media."

Err, 240 Mbit/s = 30MB/s right??! :-S

So, it would be worth getting a 30 MB/s card (as spec'd by SanDisk et
al), but still unsure about the Class differences (4, 6, 10..?).

Very confusing this stuff innit?

Shanks <> wrote:

>On 05/10/2010 15:48, J. Clarke wrote:
>> In article <i8f964$jh1$>,
>> says...
>>>
>>> Firstly, do they smoke copious amounts of crack at SanDisk HQ? What is
>>> it with their ridiculous branding and re-branding of their product
>>> range? I finally managed to work it all out. One thing I've not really
>>> understood yet is the correlation between Speed Class Rating and the
>>> speed specified on the card. For example you can get a Class 6 card
>>> that claims to be 30 MB/s. Doesn't Class 6 just mean it can handle a
>>> minimum write speed of 6 MB/s ? So where does the 30 MB/s come from?
>>> And if the Class is no real indicator of responsiveness is there any
>>> point buying a Class 6 card over a Class 10 card when all else is equal?
>>> (both state 8GB and 30 MB/s).
>>
>> Buy any class that is equal to or higher than that specified by the
>> device you're plugging it into.
>>
>>
>
>Well my main concern is shooting in continuous mode in raw on my D90. I
>don't think the D90 can utilise class 10.


Stop wasting your time thinking about that, and just follow J.Clarke's
simple advice:

> Buy any class that is equal to or higher than that specified by the
> device you're plugging it into.


The operative words are "equal to OR HIGHER". It doesn't matter if
the SDHC card is of a higher class, it will still work just fine.

On 05/10/2010 16:16, Bruce wrote:
> Shanks <> wrote:
>
>> On 05/10/2010 15:48, J. Clarke wrote:
>>> Buy any class that is equal to or higher than that specified by the
>>> device you're plugging it into.
>>
>> Well my main concern is shooting in continuous mode in raw on my D90. I
>> don't think the D90 can utilise class 10.
>
> Stop wasting your time thinking about that, and just follow J.Clarke's
> simple advice:

Wasn't worrying about it or rather was worrying *more* by the fact that
the class ten cards are a lot more money and may offer me no real world
benefit.

>
>> Buy any class that is equal to or higher than that specified by the
>> device you're plugging it into.
>
>
> The operative words are "equal to OR HIGHER". It doesn't matter if
> the SDHC card is of a higher class, it will still work just fine.

Herein lies the problem. Seems a class six card would be equal to or
higher than the device I'm plugging it into, if I remove my laptop from
the equation.

It's only £££ I'm trying to save at the end of the day :-S

Shanks <> wrote:
>On 05/10/2010 16:16, Bruce wrote:
>> Shanks <> wrote:
>>
>>> On 05/10/2010 15:48, J. Clarke wrote:
>>>> Buy any class that is equal to or higher than that specified by the
>>>> device you're plugging it into.
>>>
>>> Well my main concern is shooting in continuous mode in raw on my D90. I
>>> don't think the D90 can utilise class 10.
>>
>> Stop wasting your time thinking about that, and just follow J.Clarke's
>> simple advice:
>
>Wasn't worrying about it or rather was worrying *more* by the fact that
>the class ten cards are a lot more money and may offer me no real world
>benefit.
>
>>
>>> Buy any class that is equal to or higher than that specified by the
>>> device you're plugging it into.
>>
>>
>> The operative words are "equal to OR HIGHER". It doesn't matter if
>> the SDHC card is of a higher class, it will still work just fine.
>
>Herein lies the problem. Seems a class six card would be equal to or
>higher than the device I'm plugging it into, if I remove my laptop from
>the equation.
>
>It's only £££ I'm trying to save at the end of the day :-S


Clearly you have a lot of time on your hands.

On 05/10/2010 16:26, Bruce wrote:
> Clearly you have a lot of time on your hands.

Enough to have already looked on Google first and found no answer.

On 10/5/2010 11:57 AM, Shanks wrote:
> On 05/10/2010 16:26, Bruce wrote:
>> Clearly you have a lot of time on your hands.
>
> Enough to have already looked on Google first and found no answer.
>

Brucie meant to insult you.
What you need is the fastest card that will work in your camera, that
you can afford. Speed in processing in your camera will help. Faster
than that may be wasted.
Speed in downloading from the card to my computer is nice, but not as
important.


--
Peter