How to securely wipe/shred data from USB flash stick

I want to securely wipe data from my Sandisk USB flash drives

The usual File Shredder and other shred apps which work great for HDD apparently don’t work well on USB flash drives. The repeated wipes wear out the drive’s life, and additionally due to the way the USB allocates each wipe to different parts of the drive (wear levelling), the original data could stay intact in parts of the USB memory.

I know about smashing/incinerating and encrypting data at the outset (that wasn’t done). I want the drive to be useable but have all sensitive data wiped beyond recovery.

There is Secure Erase and Sanitize but they seem to be for SSD cards and I can’t find how to do something like that.

Hello, 

in that case what you can do with the usb flas drive is to perform a slow deep format with the drive. so you can perform a normal format and ensure that you uncheck the quick format. 

for the detailed steps you can visit this link

http://kb.sandisk.com/app/answers/detail/a_id/312/kw/format

Thanks for the idea, but from my research if it was as simple as a deep format then that is what would have been recommended more widely. It seems that deep format doesn’t do the trick on a USB flash drive, you need to invoke the media’s secure erase function somehow.

IMO Considering the price of new flash drives, smash them with a hammer, throw them away and buy new ones.