USB key sub-systems

[lo5750ul]

Hi all,

I need to find out how the internal systems in a USB key work. i.e. the memory controller, the USB controller and the IO controller between them.

The reason for this investigation is that out of 10 different USB keys I have ranging in size from 16MB to 2GB, only 2 of them will boot when we have applied our boot image to them; 1 of the keys will not even be recognised by the BIOS even though it is a brand new production ready, but unreleased, USB 2.0; 2 of the keys will not be recognised as bootable by the BIOS; and the other keys state Invalid Boot Disk.

There is some inherant difference in the way these keys work and I need to know what that is.

Any help any of you can provide is very much appreciated.

Cheers,

Lost (in a sea of keys) Soul

 

[acemcmac]

I read in a maximum PC a few months ago... mabye last spring break... abut how there is a USB>Flash bridge controller. I'm thinking differnt brands/quality/revision controller chips are probably whats messing you up.

Good luck, sounds like a fun project. I wish I could get paid to do that :beer:

 

[acemcmac]

I read in a maximum PC a few months ago... mabye last spring break... abut how there is a USB>Flash bridge controller. I'm thinking differnt brands/quality/revision controller chips are probably whats messing you up.

Good luck, sounds like a fun project. I wish I could get paid to do that :beer:

 

[lo5750ul]

bump

 

[lo5750ul]

another bump :-/