Read only file means that when we put the customer files in the USB flash drive,and the file will not come out automatically,when you plug USB flash drive in the computer.but you can see it in “my computer” and it is undeleted too,of course,you can open this file after double click the read only file!There will be two partitions in the USB stick,one for storage read only file,the other one for normal use.

But the same as autorun file that after making the read only file,you are not allowed to use the CD function