Compact Flash Card speed problems
Hi,
I'm really confused!
I bought a new Sandisk Extreme IV UDMA card and tested it in my Canon 1D Mark II.
The results are at:
http://www.clarkvision.com/imagedeta...ash_card_speed
Out of the box I ran tests monitoring the write speed as the card filled up. Great results, and pretty much the same write speed right up until the card was full. (Blue curve on figure 1 on the web page).
The I reformatted it in camera and did the test with raw + jpeg. Poor results. (Green curve on the web page).
Finally, I reformatted again in camera and did the test again with raw only. The results should have been equal to the first, but are pretty poor. (magenta curve on the web page).
It seems that the Canon card format might be different than the original Sandisk format. After the camera formatted the card, the format said FAT32. Does anyone know what the format on the card is out of the box?
I have noticed a slow-down of write speed as cards approach full with all my Canon cameras. Have you noticed this issue with 1D III models?
Any ideas what is going on? I want the performance I got out of the box. Any idea how to get it back?
Roger