>     I've been running into troubles with my small stack of RZ25L's. I'm
> trying to low level and map out bad blocks. I have been trying to do low
> levels and testing on my Mac, but I keep getting unrecoverable errors in my
> formatting utilities upon verify about 2/3 the way through most of my
> drives.

I keep a VAX handy (VS3100) and format all my drives on that beast.
A test 75 or there abouts at the prom will format the disk.  About
5 passes on the format will clean up almost any disk, if it is
resurrectable.  

Bob