Adaptec's rhymes with:
ameritech's, ametek's, armtek's, audiotex, avtex, aztecs, biotechs, centex, cytotechs, discotheques, entex, equitex, eyetech's, gatx, genentech's, gtech's, intex, kaisertech's, latex, memtec's, metex, natec's, pillowtex, playtex, portec's, qintex, railtex, scitex, symantec's, syntex, trintex, ventritex, vertex, videotex, wedtech's, westtech's
Adaptec's sounds like:
adaptec, adapts, adoptees, adopts, at-bats