the compactflash port accepts a type 1 compactflash card. you can use it for file transfer tasks such as loading a new software image. the compactflash card is optional, and can be obtained from third-party suppliers.

    for more information, refer to using the compact flash on the catalyst 4000 family supervisor engine iii and iv at the following url:

    http://www.cisco.com/univercd/cc/td/doc/product/lan/cat4000/inst_nts/ol_2788.htm