WM5torage will export the flash memory card inside the smartphone as usual USB Mass Storage device (ordinary "usb disk") - effectively turning smartphone into a flash reader.
Take note that speed will be dependent on your PDA/smartphone hardware - it will be high-speed USB only if your device actually high-speed capable (most are not), and also most devices have quite slow flash writers.
Some devices with proper hardware support perform in spectacular speed though (for example HTC Athena works in high USB 2 speed if you export a microdrive).
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