** The rotor drive train in helicopters uses a freewheeling clutch to disengage the rotors from the engine in the event of engine failure, allowing the craft to safely descend by autorotation.

** FTL Drive or Jump drive

** pellō, pellere, pepulī, pulsus ( to beat, to drive away )

** agō, agere, ēgī, āctus ( to do, to drive )

** Sex drive is dependent on androgen levels only in the presence of estrogen, but without estrogen, free testosterone level actually decreases sexual desire ( instead of increases sex drive ), as demonstrated for those women who have hypoactive sexual desire disorder, and the sexual desire in these women can be restored by administration of estrogen ( using oral contraceptive ).

** Shims left out from front end of torque tube drive plate in automatic cars, this sometimes cause engine thrust bearing failures.

** North America manual tranmission model now uses same shorter final drive ratio as used elsewhere, to simplify production.

** Disk drive

** Magneto-optical drive

** Hard disk drive ( magnetic )

** USB flash drive ( also known as a " thumb drive " or " keydrive ")

** Solid-state drive

** USB flash drive, a storage device

** Pope Clement VI unites several of Rome's upper-class nobility, who drive Cola di Rienzo out of the city

** External hard drive

** Flash drive

** Disk drive ( increasingly rare in modern use )

** CD-ROM drive

** DVD-ROM drive

** " Western Digital drive is DRM-crippled for your safety " The Register.

** proxy-detection: in-vehicle sensors measure leaf status ; this requires the farmer to drive around the entire field.

** Norton Ghost, a hard drive disk imaging utility

** San Francisco Bay Area, or simply the Bay Area

** C. v. aridus ( Lawrence, 1853 )-Jaumave Bobwhite-west-central Tamaulipas to southeastern San Luis Potosi

** C. v. maculatus ( Nelson, 1899 )-Spot-bellied Bobwhite-central Tamaulipas to northern Veracruz and southeastern San Luis Potosi

** Captains Regent of San Marino, 1900 – present

** Captains Regent of San Marino, 1700 – 1900

** Captains Regent of San Marino, 1500 – 1700

** Captains Regent of San Marino, 1243 – 1500

** Aurea of San Millán

** Montezuma Creek ( San Juan River )

** Mycological Society of San Francisco

** Dedication of the Basilica di San Giovanni in Laterano, Cathedral of the Pope ( memorial feast day )

** San Ernesto, Che Guevera as a saint.

** San Diu ( people, language is archaic Cantonese )

** San Esteban del Rey ( Acoma Pueblo )

** Championship since moving to San Francisco.

** San Sebastian Festival Winner of the FIPRESCI Prize

** The San Francisco Bay Area, anchored by the cities of San Francisco, Oakland and San Jose.

** In San Diego County: Oceanside, Vista, and Carlsbad are sometimes referred to as the tri-cities.

** In San Antonio, Texas, computer pioneer Datapoint files for Chapter 11 bankruptcy.

** Some 200, 000 protesters march through the streets of San Francisco, protesting Anita Bryant's antigay remarks and the murder of Robert Hillsborough.

** San Francisco elects City Supervisor Harvey Milk, the first openly gay elected official of any large city in the U. S.

** Some 400 – 1, 000 students march through Times Square, New York and another 700 in San Francisco, in the first major student demonstration against the Vietnam War.

** Pacific Air Lines Flight 773 crashes near San Ramon, California, killing all 44 aboard ; the FBI later reports that a cockpit recorder tape indicates that the pilot and co-pilot had been shot by a suicidal passenger.