Q: a lot of used space is still reported in iBooks after deleting all ebooks

Hi,

I recently give my daughter my old iPAD mini, so I deleted all the ebook stuff on it. There was about 20 GB reported on use only by iBooks.

Although some space has been freed, iBooks still reports about 6 GB of used space - although is almost empty (only four small ebooks, less than 1MB). I have tested it using not only iBooks, but iTunes and an app called iFunBox. All of them reports the same: iBooks is empty, but it is still using 6 GB of space.

Also, the iBooks app shows a sluggish performance, as if it were managing a lot of content.

I'm using iOS 8.1.2 and a first - generation iPad mini.

Regards.