Panasonic intros next-gen SD camcorder, new card
Panasonic intros next-gen SD camcorder, new card
The 4GB card is the first to bear the SDHC logo: SD High Capacity. In reality, the logo is more important for the read/write hardware, such as digital cameras; basically, it says, "FAT32 spoken here." The other aspect of the latest iteration of the SD spec also clarifies--and I use the term loosely--card performance by clumping them into groups by minimum sustained data transfer rate (MSDTR): Class 2 equals 2MB per second, Class 4 equals 4MB per second, and Class 6 equals 6MB per second.
The only possible rationale I can see for this system is to allow marketers to snow consumers with ambiguous performance claims. To wit: a card with a 3.5MB-per-second MSDTR and one with a 2MB-per-second MSDTR both become Class 2 cards, despite the fact that the former's performance is closer to that of a Class 4 card than of Class 2. Why can't they just report the actual MSDTR or translate the performance to some sort of normalized scale (along the lines of the older x ratings) if people are scared of the real rates?