Is the U disk made of magnetic material?
Not a magnetic material, is the main body of semiconductor material silicon.U disk is the "flash" (Flash Memory). It is made from silicon integrated circuits, each binary storage unit is a transistor and FET. Very similar, not by magnetic storage, but the injection or removal of electronic storage of binary information.
U disk is usually made with flash memory and control chip. Without magnetic material, it should be semiconductor material.
No Because you don't use magnets to get the data to go away
