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You can use Eraser Portable by plugging in your portable device on any computer and use it just like you would on your own computer.
It is a repackaged version of the popular Eraser utility designed with portability in mind, so it has all the same great features of Eraser, but there's nothing to install.
Flash Drive Note: Most modern flash drives use wear leveling to spread write operations out over a device. This interferes with Eraser (and other secure deletion utilities) ability to wipe single files. Wiping an entire drive or erasing a file and then wiping free space should still work securely, though it will put additional wear on your drive.
Here are some key features of "Eraser Portable":
· Eraser Portable is a secure file-deletion and data wiping utility. With support for multiple wipes, pattern writing and more, it can be used to securely delete any sensitive data.

Via: Eraser Portable 5.8.8.1