Malware spreading question

I have a question and was hoping to get some info from someone on this forum with knowledge of trojan malware viruses and how they work.

A few months ago I got a trojan virus on my laptop. I tried a few programs to remove it (a-squared, Ad-Aware, Spybot), but none seemed to completely remove it. So I moved my data to an external hard drive, then wiped my hard drive clean. I scanned my external hard drive with several programs (malware bytes, AVG), and it appears to be clean. That being said, I would like to know if it is possible that the trojan may have made its way off my hard drive in other ways. For instance, from time to time I synced my Blackberry with my computer via a USB connection, so that I could move music files from my computer to the Blackberry. From time to time I also plugged my camera memory card into my computer via an adapter that plugs into a USB drive, just so I could move pictures off my camera memory card onto my computer.

Is it possible for a trojan virus to move itself off my hard drive and possibly onto my Blackberry or my camera memory card?

To anyone who is able to reply, thanks in advance for your help.