Quote:
Originally Posted by kennyc
The SD card is a serial interface
SD cards typically have transfer rates in the range of 10-20 MB/s,
USB 2.0 has a raw data rate at 480Mbps, and it is rated 40 times faster than its predecessor interface, USB 1.1, which tops at 12Mbps. Originally, USB 2.0 was intended to go only as fast as 240Mbps, but in October 1999, USB 2.0 Promoter Group pumped up the speed to 480Mbps.
|
Yea! But!
Iit still has to write the Internal/external SD memory... Which you point out is Limited to 10-20MB/s
You are confusing Bus
capability with practical application
If you could Write to both the Internal
and the SDcard slot at the same time, you
might double the transfer rate (20-40MB/s.)
Only a few devices can handle the theoretical USB 2.0 speed and you are using a major portion of your PC'c data bus speed at that rate.