3380s and 3880s were certainly around when I was at IBM in 1985-86, mostly on 308X mainframes. I'll have a look-see if I have any info (probably just marketing bumf as usual). It is the clear plastic case that intrigues me. Do you mean you can see the platters and heads and things? I have a vague memory of the HDs in our system/34 being like that. Nice. I also once saw a later disk model (9330 or something like that?), demo version, which not only had a clear plastic case, but had the platters replaced by discs of clear plastic, too. It didn't power up or anything - strictly for showing tourists when on the factory tour... Philip.