Usb Mass Storage Devicenand Usb2disk [best] Full • Bonus Inside

When the FTL mapping table is lost, the controller cannot find any free physical blocks. To prevent further writes (which would corrupt existing data), it returns a "disk full" status to the OS.

This is endemic to cheap USB drives from online marketplaces. A manufacturer takes a 64MB NAND chip and hacks the controller to report "64GB." When you write more than 64MB of data, the controller silently overwrites old data or throws a "disk full" error. usb mass storage devicenand usb2disk full