In the process of cataloging general books, if the books are accompanied by CDs, the library will catalog the CDs separately and will not put them in the books, which is to prevent the readers in the library from taking them for themselves. Therefore, if you don't have a CD when you borrow a book, you can explain it to the administrator. It is best to find the administrator who will help you with the formalities on the day you borrow a book. The library's book management software must have the administrator's duty record. If the administrator doesn't listen to your explanation, you may unfortunately pay for the CD.