> That card's listed as a "Class 4" device. The SDCard.com web site > indicates this means that the manufacturer guarantees at least 4 MB/ > sec > or higher write speed, which sounds pretty slow. How does that > compare > to the "X speed" notation, i.e., 150X, 133X, 60X, etc.?
The speed notation is a factor of the speed of a single-speed CD writer. It is used for other media types like SD cards as well. A speed of 1x means 150KB/sec. The SD 2.0 specification (SDHC) also defines speed-classes. Class 4 devices must deliver read/write speeds of at least 4 MB/sec (~25x). In comparison to state-of-the-art technology, a class 4 device is really _slow_. It will most probably slow down any modern digital camera. A modern, fast card delivers read/write speeds around or exceeding 20 MB/sec (133x/150x). The SanDisk Extreme III that I always use are guaranteed to deliver a minimum of 20 MB/sec. They also come with a lifetime guarantee, although I have yet so find or hear of someone who actually ever had problems with a Sandisk Extreme III. Panasonic SDHC cards are said to be fast and reliable, too, but they are also a little more expensive. Marcus -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
