I am trying to format a disk on my 1581, which is disk B. I get a format error every time. I downloaded format81, and after much transferring and writing (BBR is great), i got it on a CP/M formatted disk. When I enter "format81 b:" it doesn't even run the drive and says format error. I have formatted a disk under basic, so the drive should be OK, and have tried a couple of disks. Any suggestions?