In the process of installing an FPU in my Blizzard this morning I noticed the DF0: was loose. I removed the drive and installed a drive I had purchased from AmigaKit for the A600 which is in the shop. I installed this drive in the A1200 and, surprise surprise, the df1: is now working!! 13 years and I finally fixed it! looks like I'm tossing that Panasonic and ordering another drive!