On Thu, 7 Jun 2007, Bob Rosenbloom wrote:
According to the manual, that's a servo reformatting kit for the 7906
drive:
http://bitsavers.vt100.net/pdf/hp/disc/07906-90905_CE_Jul84.pdf
Mike Loewen mloewen at cpumagic.scol.pa.us
Old Technology
http://sturgeon.css.psu.edu/~mloewen/Oldtech/