Be careful when attempting to wipe a flash drive of sensitive data (you probably left some bits behind)
Did you know that it's really hard to wipe an SSD or USB flash drive of data? The following quote is from a ComputerWorld article entitled "Can data stored on an SSD be secured?"
"USB flash drives didn't fare much better. Between 0.57% and 84.9% of the data remained on the drive after an overwrite was attempted."
Read the whole ComputerWorld article here.
The original research from UCSD is here.