Hi All, I've used 4 Gb cards on the bookcourier without any problems, although it does take a while to say something when you insert a 4 Gb card, so be patient. Thanks. Brian Cairnie Cragside AccessABILITY Limited Telephone: 0844 500 7091 Fax: 0844 500 7098 Email: info@xxxxxxxxxxxx Web: www.cragside.com