S.D.I is German speed metal band from Osnabrück,formed in 1986.
They released three studio albums: Satans Defloration Incorporated (1986), Sign of the Wicked (1988) and Mistreated (1989). Their sound is reflected in the fast rhythms with double bass pedal influenced with classic bands like Motorhead,Metallica etc. The band also recorded tracks for a fourth album which was never released. Some of these tracks appeared Battle Cry Records' 2005 reissues of S.D.I.'s back catalogue.

Last known lineup:

Ralf Maunert - Drums
Rainer Rage - Guitars
Reinhard Kruse - Bass,vocals
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