This is a CD Filled icon. We've made it in iOS style, first introduced in iOS version 7 and supported in all later releases up until now (at least iOS 11). This style is based on thin two-pixel lines and is optimized for 50x50 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 13,300 icons, all in the same style and quality.
Idea of CD Filled Icon by bath
We've received the idea on October 13, 2012 and created the icons on January 8, 2013
I'm surprised that media format icons seem to be absent (or have I missed them?). The only one I found was LP record. I couldn't find CD, DVD, Bluray, Audio Cassette or VHS.