On Mon, Feb 10, 2020 at 6:16 PM Fred Cisin via cctalk <cctalk@classiccmp.org> wrote:
> On Fri, 7 Feb 2020, Carlos E Murillo-Sanchez via cctalk wrote: > > system originally came with an RD53 that has sat elsewhere for 25 > years. It > > passed a read test in 2005. So I tried to see if I could read it and > maybe > > image it now, but no go. The disk spins up, initiates a seek (the arm is > not > > stuck in a gooey stop pad; I've read that this is a common failure > mechanism > > for Micropolis 1325's; I opened it and saw the arm move) but then the > arm > > returns violently (clacking) to the rest position; it does this a number > of > > times (two to four, usually) and then it spins down. Applied voltages > and > > currents remain ok as this happens. > > If nobody speaks up who actually know anything about them, . . . > > Q: Is the return to the reset position more violent than the usual return? > If it is not different, then consider the possibility of something not > related to positioner, such as: seek to track, try to READ, FAIL, reset, > REPEAT. In which case, it could be anything that caused the read to fail, > such as head problems, failing to find the servo data, . . . > Sorry for not replying earlier, your message made it to the spam folder. The return is more violent than the usual return. I put a piece of paper between the arm stop and the arm, and this did not modify the behavior. I am now inclined to think that it is failing to find the servo data. carlos.