A floopy drive doesn't, it will be done by (in DOS) IOS.sys from the operating system or other similar O/S software. The floopy only knows if a disk is inserted and where its head is. colin -- cdb, bodgy1@optusnet.com.au on 14/11/2002 -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads