To USB or Not to USB


SDXC and USB 3.0


Toshiba has announced that they will go into production of SDXC cards in Q1 2010.  These SDXC cards is the next generation of SD card that will be used in digital cameras, mobile phones, media players, and camcorders to store pictures, video and music.

SDXC specification supports 104 Megabytes per second throughput today and up to 300 Megabytes per second in the future.  This is a lot faster than today’s USB 2.0 32-35 Megabytes per second.  USB 2.0 just will not be fast enough.

The next question someone will ask is: Is the flash memory fast enough to handle these speeds?

The answer is:  Yes, but it will cost more (at least initially).  Memory just needs to be put in parallel so that it can be read or written to faster and simultaneously.  I would guess that early memory will be designed to the 104 MBps standard to save on cost, with premium manufacturers designing even higher, and as prices come down, the faster speeds get implemented.

You can read the SDXC announcement from Toshiba here:

You can read the SDXC specification here:

I’m also burying some news on USB 3.0 Hosts here:

Apparently ASUS has cancelled their motherboard with USB 3.0 Host.  You can read 2 articles here:

ASUS is quoted as saying the motherboard was cancelled for “not for any particularly interesting reasons”   It should be noted that the motherboard was/is a high-end premium motherboard.

Tom’s Hardware speculates reasons here:,8368.html

Let’s hope that NEC is on track for their deployment of USB 3.0 Hosts.

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