A quick google turned up this, which may be interesting for comparison: USB 1.1: 12 Mbit/s = 1,5 MB/s (10x) USB 2.0: 480 Mbit/s = 60 MB/s (400x) Bluetooth: 3 Mbit/s = 375 kB/s (2.5x) WLAN 802.11b: 11 Mbit/s = ~0,7 MB/s (4.7x) WLAN 802.11g: 54 Mbit/s = ~3,2 MB/s (21x) WLAN 802.11n: 540 Mbit/s = ~37,5 MB/s (250x)
Marcus -- Am 15.04.2008 um 15:58 schrieb Marcus A. Hofmann: >> 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. -- 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.
