>I think you're mixing up your terms. The SD designations of >HC and XC have to do with file size and card capacity. > >The speed ratings would be the old x-rating and newer Class >rating and UHS speed class. > >Nether the less, perhaps you might find this >posting at >Dpreview of some experimenting someone had done. > >If my quick scan of the information is accurate, the D7100 >will benefit from the faster Class cards. > >Pete
Yes - perhaps worded poorly - however as I understand there are now higher speed ratings for the SDXC Cards that weren't available on even the highest rated SDHC cards (e.g. SanDisk claim something like a 120Mb/s read speed against about a 75 or 90Mb/s max on nay SDHC card - so was assuming that although all are "Class 10" this may indicate a higher practical write speed within the Class 10 category - obviously not 120Mb/s though...)?