Strange. Even after you type the command:
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That message says that it loaded the ROM, though the ROM can not access the SD-Card.
Hopefully you will have better luck. RISC OS is a usable OS, and my OS of choice.Will give it a try with an alternative SD card
After the dd command did you remember to do sync (i usaully would do it 3 times for good luck)?
By default RISC OS is setup to boot from SD Card NOT USB. There is a bit of config to do to change that, and it will not work unless you have the boot files in the correct place on the SD Card.
To save you time, you don't need to prepare or format the card in any way. The ".img" file you copy onto the card with dd contains everything, including the partition table. There is also no point in making it bootable.