Bernoulli oddness

Ok, thanks to the cable Chris Bartlett sent me (thanks, Chris!) I was finally able to bring up my Bernoulli box. It seems the first drive system I tried has a problem. The driver does not see the drive when it loads. The other unit is identified and comes up just fine. Now the problem is reading or formatting disks. I can't get a directory listing or anything. I keep getting sector errors. Using the RCD utility to perform a surface scan, I find that each disk I'm trying basically fails at the same point. Sector #0 is always bad, then the rest of the disk up to cylinder 195 or so verifies fine, and then the errors start again. This is across the 10 or so disks I've tried. I've tried cleaning the heads as best I can. I have a disk cleaning cart but the pads were gone, so I replaced them with new pads (the fuzzy side of some velcro patches) and ran that through the drive. It would be otherwise very difficult to get at the head by disassembling the drive (I tried) and besides, if the heads were still dirty they would not be able to read any part of the disk, right? Any pointers here? It seems odd that, with each disk, the first sector would be bad but then the rest of the disk would be good, only to fail again at a certain point. Was there ever a 20MB Bernoulli drive? If so, my theory is that maybe these were written on a 20MB drive and I'm trying to read them with a 10MB drive, and there's a format incompatibility. Somewhat frustrating... -- Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org [ Old computing resources for business || Buy/Sell/Trade Vintage Computers ] [ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]