It's true that it has history in technological circles, but the politically correct wording appears to now be "primary" and "secondary". Interestingly, in 2003:

It's true that it has history in technological circles, but the politically correct wording appears to now be "primary" and "secondary". Interestingly, in 2003: "Los Angeles officials have asked that manufacturers, suppliers and contractors stop using the terms "master" and "slave" on computer equipment, saying such terms are unacceptable and offensive." [1]. [1] http://www.cnn.com/2003/TECH/ptech/11/26/master.term.reut/ http://www.cnn.com/2003/TECH/ptech/11/26/master.term.reut/