the interior of a Seagate ST-1 hard drive, which has been opened up. it is the size of a CompactFlash card, but has a complete mechanical hard drive inside, with a metallic platter, and a magnetic voice-coil read head connected through ribbon cables to the drive electronics.
https://drive.nya.social/files2311/e85f21f8-90d8-4950-9d98-8cd36853a649.webp