I recall seeing a CDC platter at an early VCFmw that would have been of similar size. I can't get back to any reasonable quantitative measurement at this remove. https://gallery.porterstreetcafe.com/vcfmw/2007/slide_71.html I imagine someone lurking about has CDC background and can identify. De

We have a complete RAMAC here in the museum Feel free to reach out to me. Bob Roswell broswell(a)syssrc.com 410-771-5544 ext 4336 Computer Museum Highlights -----Original Message----- From: steve shumaker via cctalk <cctalk(a)classiccmp.org> Sent: Wednesday, July 8, 2026 3:09 PM To: General Discussion <cctalk(a)classiccmp.org> Cc: steve shumaker <shumaker(a)att.net> Subject: [cctalk] IBM RAMAC platter Greetings! I recently stumbled across a early hard drive platter that appears, based on measurements, to be an original RAMAC platter.  Very little comes up in Google beyond basic measures (diameter of 24" and a head motion of 6".)   I'm curious if there was anything out there that had similar measurements.   I did find a photo on facebook but it clearly has different measurements. Platter is in poor condition (no oxide, nicks and dings, etc although still obviously a platter) but the owner is fascinated with possible origin. Steve