| On Wed, 28 May 2008 08:56:05 +0800, "k" <
[email protected]>
| wrote:
|
| >
| >| >
| >| According to Galbraith, the apparent speed of a memory card depends a
| >| lot on the camera it is used in. Could be very fast on one device but
| >| slower on another, and one card could be faster or slower than another
| >| depending on the camera.
| >and in a pocket PC i'm sure its the same, however as I'm sure no camera
| >owner cares which camera is fastest,
| You might feel you are sure but it is not so. Many (most?)
| cameras are slower than what are now dirt cheap flash cards
| if you don't need over 4-8GB (or higher in the future), so
| the speed of the camera is what determines how long one has
| to wait inbetween shots. Sometimes the camera has a
| reasonably sided buffer, <clipped>
I beg to differ but it *is* so.
The point being that the camera is the non-variable in the equation, the
memory card is the variable. The computer is the non variable, the pocketPC
the non variable .. the card again is the variable that we're discussing.
No one asked which bus is faster, which CPU gives the faster transfer - the
original poster wanted to know (as per the subject line) how to do a speed
comparison on an SD card - that's the variable. I have a pile of CF cards I
do noty use in my cameras because the transfer speed is sooooo slooow (!)
I know my camera will never be able to dump data at SCSI speeds but in the
case of these cards, they are the bottleneck. I even speed tested them with
the program I mentioned to get a *comparison* with my other cards and yes,
they are appallingly slow.
And in using the program I suggested I was very surprised to find a cheapy
Chinese microSD card was a *lot* faster than my horribly expensive high
speed CF cards. I was delighted to discover this, because although I wont
use the microSD in a CF adapter in my camea for the resons you point out, I
*will* use it in my pocketPC where the speed actually is noticable
The original posted wanted to know "My impression is that my old 150x card
is faster that the new class 6 SDHC card. Is there any way to verify if my
impression is true?"
the program I suggested would allow him to determine this (that card A is
faster / slower than card B)
me:
| >... rather they'd be more concerned which
| >media is fastest for them, and a comparative speed would be more use than
| >any raw figures
| Yes, that too is important. Remember that many people
| aren't reading from the camera, they'll take the card out
| and pop in a second empty one leaving the reading to another
| device... probably a USB card reader.
yes fortunately! Though I'm still astonished to discover how many people
use the rotten bundled software and link via the camera. I work with
photographers a lot, and I still find even pros that do this!
to each other! "
|
| That is useful, yet one person's goal is not always
| another's. If performance matters it's not just a matter of
| picking the memory but also the device reading and writing,
| especially when it is the more costly and time consuming
| item to replace if a bad choice was made.
of course you're right. but again if the original posted wanted a speed
comparison in his particular working environment, there's not better way
than to test it in his environment. benchtests are nice, but we are all
really concerned with how it affects us in our own personal real world
karl
