SDII

SDII (Sound Designer II, sometimes abbreviated as SD2) is an audio file format originally created by Digidesign for their Apple® Macintosh-based recording and editing applications. It is still supported by many DAWs and video editing applications. SDII development ended in the early 2000s when Broadcast Wave Format (.BWF) audio files were introduced, promising better interchange between applications and operating systems, higher sampling rates, and expanded meta-data support.

SDII does not support sample rates above 48kHz or word lengths beyond 24-bit.