Quote:
Originally Posted by Dave_S
I really do not think that it is a buffering problem, since the problem is pretty much the same in Linux or Windows, and there is no problem at all with any other USB device. The SanDisk Cruzer memory stick got very respectable speeds for a NAND FLASH device.
I *think* the problem is in the drive strength for the USB data pair lines, causing the rise/fall times of the USB2.0 waveform being right on the edge of reliability, and causing data errors. Another one of the things that make me think that is that the PocketPRO works even worse with other USB2.0 cables than the one supplied with the PocketPRO. I have tried other USB2.0 cables, with and without the ferrite filter block, and all of them produce even worse results, up to and including the computer not even recognizing what kind of device had attached to the USB port. All of that smells like physical data integrity problems on the USB2.0 interface. Since USB1.1 uses a 10x slower main clock speed, the signal rise/fall times problems go away when USB1.1 speeds are used.
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My first PEZ had connector problems and needed just the correct amount of pressure to even connect. I also noticed that the factory cable worked better than the slightly longer
gold cable bought at Frys. I will pop over there and add a snap around Ferrite filter to my "spare" cable.
Thank goodness I got a model that has a SD card slot. I can live with this
