There are several disadvantages to be aware of with ebooks:
1. Some people don’t like reading books on a computer screen. (But they could still print the ebook on paper if they prefer).
2. Ebooks made with some software require certain hardware and software to be installed, e.g. they might not be able to be read on a mac computer, or perhaps on a PC that does not have Internet Explorer installed.
3. Ebooks can be lost if someone’s hard drive fails and they had not made a backup.
4. Some people worry that the ebook will not be readable by future e-book devices.
5. Ebooks might be hacked, copied or distributed without the author’s or publisher’s permission.