[Coco] Disk drive question

[Robert Gault]

Bill Pierce wrote:
> My drive on a Coco 3 with 2meg memory, Fd-502/J&M controller, with/without multipak. 1 40trk DS, 1 80trk DS (tried switching drives and jumpers). The drive will read and load an OS-9 level 1 system disk but when I try (several) Os-9 level 2 boot dsks, it either freezes on "OS9 Boot" or starts to boot then resets back to DECB. These boots are know to be good. It also errors on sector 0000 when trying to format a disk. DECB seems to format fine but I have no DECB disks handy to check. OS9 "backup" does not seem to work. lists several errors as it formats, backup disks will not boot afterwards. I've cleaned contacts and attempted to clean heads as well as I could with a q-tip. I do bot have a 2nd coco to check for a bad coco. It seems to be working fine. All commands work fine from the Level 1 boot.
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Are you using stock OS-9 or a recent NitrOS-9 floppy?