When I was maintaining Alto Is, I put a warning sign on the machines that
stated "Avoid VD --- Venereal Disks! If your disk doesn't load, do NOT try
another machine"...
For the most part the drives were OK, but if they did fail, then the
contagion could be spread. I certainly had my share of disk crashes.
There's a reason the Alto file system had the scavanger and was designed to
be recovered...