The Legendary Wicher CDTV is a Amiga CDTV-compatible memory card providing up to 8 MB FAST RAM (via SDRAM memory) and IDE 2.5” hard drive support.

Specification:
  • Amiga CDTV-compatible,
  • RAM characteristics: 8MB SDRAM,
  • Amiga 600-compatible IDE controller - required Kickstart = 2.05 (37.350) and BootRom = 2.30,
Recommended Kickstart version: Kickstart 3.1 and BootROM 2.30

It was removed working from my CDTV and is no longer required.