I've found a site with what looks like most all ATA/IDE specifications http://www.t13.org This is the official site for Technical Committee T13 - the people who make the ATA spec. I've already got the ATA-4 and ATA-5 specs from them. Anyone interested in worki ng with IDE devices with PICs should probably look here for info. -Randy http://i.am/PICxpert - PICxpert@techie.com ICQ Nickname: PICxpert - Fax: (208) 330-3630