Note that what you said is a bit messy: the main components of the U disk are the main control chip and the storage flash memory chip.
The main control chips are: Mike Weilian Shengxinbang Xinchuang Anguo Qunlian Qingtai Rong Hui Sandisk = = = = = = =
Rong Hui Qingtai Qunlian Anguo's new fame is ok, but McVeigh is not. Used in many cottage expansion disks.
Flash memory includes: Samsung Hyundai Micron Toshiba Sandisk Intel = = = =
Memory chips are still valuable from Samsung, and others are not bad.