Write speed on SD required for continuous shooting

I'm moving from a Canon system (CF card based) to the K10D. Has anyone seen the required speed for the SD card in order to have "continuous shooting till card capacity"?

I've looked and can't find it anywhere.

Michael

bump.

MichaelToler said:

I'm moving from a Canon system (CF card based) to the K10D. Has
anyone seen the required speed for the SD card in order to have
"continuous shooting till card capacity"?

I've looked and can't find it anywhere.

Click to expand...

I don't know anything certain but my estimate is that you will need at least 10 MBytes/s ...

MichaelToler said:

I'm moving from a Canon system (CF card based) to the K10D. Has
anyone seen the required speed for the SD card in order to have
"continuous shooting till card capacity"?

Click to expand...

According to the Pentax manual you get 800 10 MB JPEGs to a 4GB card, so 5MB per file. At 3 per second, the card needs to write 15MB/sec

That should be a pretty straight forward thing, but I think it's not, because those SD card specs they give are probably based on read speed, not on write speed.

I just checked the specs sheet for a Patriot 4GB 133x SD card, in description it says

"The Patriot Extreme Performance (EP) Plus Secure Digital
is engineered to provide enthusiast a high-speed data
transfer of up to 133x (20MB/s)."

Under features it says:
Up to 133X (20MB/s) Read
Speed

Now what is the write speed of this SD card? The specs sheet doesn't reveal it. (The sheet has the same data for 1GB, 2GB and 4GB cards, except for different storage capacities)

James O'Neill said:

MichaelToler said:

I'm moving from a Canon system (CF card based) to the K10D. Has
anyone seen the required speed for the SD card in order to have
"continuous shooting till card capacity"?

Click to expand...

According to the Pentax manual you get 800 10 MB JPEGs to a 4GB
card, so 5MB per file. At 3 per second, the card needs to write
15MB/sec

Click to expand...

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http://pbase.com/waqas

WaqasUsman has it right; the speed ratings on SD cards have nothing to do with write speed, sadly.

Unfortunately, while SDHC uses a different system that does deal with write speeds, it has useless categories; 2MB/s, 4MB/s, and 6MB/s, and nothing higher. So if you want to ensure high speed, you'll have to stick to higher-cost brands that actually reveal the write speed in their specs (like the sandisk ultra cards).

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