Quote Originally Posted by Richard Lane


I also received my 32GB 90MB/s SanDisk Extreme Pro CF card.


With the 7D, I just shot 70 raw shots which totaled 1.31GB of data for 20 seconds and the red access light stayed on for an extra 7 seconds after I stopped shooting, for a total of 27 seconds.


I ran the test 3 times with similar results.


1310MB/27sec = 48.5MB/sec.



Hi Rich,


Good, I am glad to hear it. I just re-ran my tests and the new 32 GB 90 MB/s card is still writing at 17-18 MB/s. I must have received a bad card. I'll be contacting B&H, not so much that my shooting style needs 90 MB/s, but more because if one thing is wrong with the card, what else is wrong with it?


Bob,


I'd be happy to run additional tests. I have been conducting mine with the following conditions:
  • EF 100 mm L, AF off, IS off, auto review off, manual mode set to 1/100, f/5.6 and ISO 100, RAW only, High-speed continuous mode
  • Shooting at a blank white paper
  • Recording the number of shots, file size and write time (red LED) after shooting for 3 seconds (typical time to fill buffer) and 20 seconds.



My file sizes are typically 17.5-17,.8 MB per picture.


That said, I buy Rich's results. It makes sense that the 7D is limited to the ~50 MB/s range and that cards can perform up to that range. I still think I will stick with the 90 MB/s even though it is not needed for the 7D just because it may be of use for something down the line.


Thanks for all your help,


Brant