Just a "Navy story". There have been comparably heavy (and often faster spinning) motor-generators on ships since the 1930s, and they did not have problems. That, and a ship being tossed in a storm subjects those heavy rotating machines to worse forces.
-- Will On Wed, Dec 20, 2017 at 12:12 PM, Paul Gilmartin <[email protected]> wrote: > On Wed, 20 Dec 2017 07:08:40 -0600, John McKown wrote: > >>It's not really a drum, but it is getting closer. Of course, for true >>speed, one should go SSD. >> >>http://www.theregister.co.uk/2017/12/19/seagate_disk_drive_multi_actuator/ >> >>[quote] >> >>Seagate is increasing IO performance in disk drives by separating >>read-write heads into two separate sets which can operate independently and >>in parallel. >> > In contrast, the StorageTek SuperDisk had 4 spindles served by a single > X-shaped actuator. It sold poorly at first because the medium wasn't > removable. Then IBM introduced a drive (33xx?) with permanent medium > which somewhat legitimized the market for StorageTek. > > There's a legend ("Navy story") of a Univac Fastrand drum mounted on a ship. > The ship made a sharp turn and gyroscopic torque pulled the mounting bolts > out of the deck. > > -- gil > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
