On Thu, 5 May 2005, Lee Courtney wrote: The 7920s were 50Mb. The head crashes had a lot to do with how clean your computer room was. I used to work for a company doing 3rd party maintenance on HP3000 systems. We had a couple of customers who installed a humidifier in their computer room, unfortunately the type that left a fine white powder residue. I ended up replacing multiple heads in the 7925s and practically disassembling them to clean them up. The white powder goes straight through the foam filters. As I recall, the usual cause of head failure on the 7920s and 7925s was one of the wires to the head breaking. They could be replaced and aligned without too much pain, with an alignment pack and a scope. Mike Loewen mloewen at cpumagic.scol.pa.us Old Technology http://ripsaw.cac.psu.edu/~mloewen/Oldtech/