The 4.21 series introduced several technical improvements over older versions:
: Improved recognition for Innostor IS918M controllers and updated logic for HOSIN and Alcor AU6989SN chips. chipgenius v421 top
When you right-click the USB entry in v4.21 Top, a context menu appears: chipgenius v421 top
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One of the most common points in reviews for ChipGenius is its tendency to trigger false positives in antivirus software. Fix All flash drive problems by resetting it's software 30 Jan 2016 — chipgenius v421 top
Even if the controller spoofs the capacity (via a malicious firmware setting), it cannot change the physical chip model. v4.21 Top will read the exact Model Number of the NAND flash (e.g., Hynix H27UBG8T2B ). You then Google that model: