On Wed, Jun 11, 2008 at 4:23 PM, Bob <w8imo@xxxxxxxx> wrote:
Thanks. This works out. The description on a SanDisk Ultra II 4G at Costco says 100X and SanDisk's site says 15MB/S.....
Thanks,
Bob
James Schenken wrote:
Bob:
I believe that value for a 1X speed for a media card is 0.15 MB / sec
So:
4X = 0.6 MB / sec
12X = 1.8 MB / sec
24X = 3.6 MB / sec
240X = 36MB / sec
etc.
Things get more confusing when you look at read vs write speeds ( they are not the same for all cards of the same speed rating ).
And, there is UDMA, a new read/write technology the increases transfer speed IF you reader / camera supports this technology.
For example, the SanDisk Extreme IV 4GB cards supports this transfer protocol as does the Nikon D3.
But other Nikons may not, especially ones that are a few years old. ( The same caveat applies to other manufacturers as well but I haven't kept up with them. )
Lest anyone have a different brand they prefer, that's just fine, I'm not even suggesting the SanDisk is better than your favorite brand, just using it as illustration.
So,
If you want test results for some particular card, go to:
http://www.kenrockwell.com/tech/cf-sd.htm
Cheers,
James
At 10:12 AM 6/11/2008 -0500, you wrote:
Some time ago we discussed speed numbers vs MB/S (100X vs 15MB/S). Does anyone still have any info on this?
Thanks,
Bob
James Schenken
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