About a year ago i purchased a 16gb innostore usb flash drive. It crapped out on me once again (my blog) and the best format was only ten megabytes and that was with a clearing of the partition table.
I recommend that if you are looking for an usb flash drive steer clear of innostore brand. The device is awaiting a journey to a ewaste disposal plant.
I had recorded A Girl Walks Home Alone at Night a film which had five minutes of logos and titles before the thing died and then accessed the next item.
If you value data avoid innostore.