The 3" discs for the Amstrad Disk Drive are called CF2 (Compact Floppy Disc). CF2 discs were produced by AMSOFT, MAXELL, Schneider, Panasonic. In late eighties, cheaper Noname discs were also available (although these were rather unreliable).
Capacity is 180 Kbytes per side (the discs can be flipped to access the other side, giving a total of 360 Kbytes per disc).
(This article, File:Amstrad Computer User8504 072.jpg, also mentions something called Hitachi HFD-2 discs.)
Pictures
- Floppy Discs used by Amstrad CPC / PCW & +3 - The Good from John King
Amsoft CF2 in Jewel Case (Sealed)
Tatung - Picture from John King
Maxell CF2-D for Amstrad PCW (Sealed)
Amsoft CF2DD for Amstrad PCW
- The Bad - from John King
Dixions - Picture from John King
Unknown - Picture from John King
Copy (or poor quality) Amsoft 3" - Picture from John King
Wiz Disc - Picture from John King
Diskxpress - Picture from John King
Unknown - Picture from John King
- And the should know better - from John King
A look-a-like Maxell 3" - Picture from John King