Today I'm researching the security aspects of USB flash drives.
I'm aware of some issues surrounding hard disk drive storage -- whenever I'm deleting sensitive data I use the Unix shred utility (or equivalent). But I've heard that in some cases, information can be recovered even after it has been overwritten many times.
That aside, I'm looking to purchase a USB flash drive, and the main requirement is that once I delete data off the drive, it can never be recovered.
One of my colleagues advised me against NAND-based flash memory and recommended that I look into NOR-based flash memory instead. He didn't know for sure though -- he had just heard this somewhere.
So basically I need some more information. Would I still need to use a shred utility on NOR-based flash memory. Would there be *any* possibility of recovering data off it? Should I be using flash at all, or some other type of memory?