IBM had DASD (anyone pronouce it?); CDC had RMS.
Crossing between
 the two cultures could be very confusing. 
     I say "dazzdee".  I've never heard anyone say "Dee Ay Ess
Dee". 
 
 It's mostly been Dazz Dee for me;
 however, occasionally I have heard or said Dee Ay Ess Dee
 How about IBM's CKD - always "See Kay Dee"? 
 
Most people I've heard say "see kay dee", but some people have said
"sicd" as in "he sicd the dog on me".
Peace...  Sridhar