On Wednesday, March 30, 2016 at 8:19:03 AM UTC-4, James Longinotti wrote:
I have a Lisa that has come into a bad situation. I was low-level formatting the profile disk, and about an hour into the format, there was a loud pop and screech. one of the drive heads popped off the disk and destroyed the platters- I’m still in shock.

The X/Profile is a bit out of my price range right now and I'm just trying to figure something out.
I'm hoping someone here upgraded to an X but still had a working ST-506 around.

Hi, James.

Unfortunately the Profile does not use a conventional ST-506 mechanism.  Patrick Schaefer is the expert on this, but if I recall the details correctly the Profile has a stepper with 2x the resolution of a true ST-506.  In other words, it issues two pulses for each track increment.  I have had limited success with ST-412 mechanisms as a replacement but hesitate to recommend this solution.  It is theoretically possible to hack the Profile firmware to issue only a single step pulse on track change but I do not know if anyone has done this.

If you aren't in a position to spring for an X-Profile you may want to consider building one of Patrick's IDE File units.  I have one that I share between a Lisa 2/5 and an Apple ///+ and can highly recommend the unit.

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