The Seagate Hard Drive Utilities are probably available for download at Seagate Downloads. The one I've used most recently for Hard Drives should be the "SeaTools" in the Utilities section, but they are OS-specific.

I don't know how helpful they'd be for Flash Drives, but if they're not suitable for them, they should just burp at you and "decline to test." (You might want to try them on a small - cheaper - flash drive first to see if they work wirh rhem?)

I didn't dig down on the site to see if they have anything more specific for Flash Type memory.

John