In addition to erasing hard drives, you must securely dispose of CDs and DVDs containing sensitive data.
This article appears in the May 07 issue of PC Advisor, available now in all good newsagents.
You'll find CD and DVD shredders online, starting at around £70 inc VAT, that will turn your optical media into crumbs.
Fortunately, Flash media cards and USB memory keys don't need to be physically destroyed to be wiped clean. If you're worried that someone might attempt to recover files from Flash memory, fire up Eraser to run a few passes of random data over the drive or card.