I meant along the lines of: Two disks, low battery, and during boot the regulated supply dips out as both disks require peak startup current. Although there is inertia in the spinning disk (meaning it probably isn't toobadly affected by supply problems), disk controllers do not behave well when the +5V line gets dippy. Hence, weird data/corrupted data/incomplete seeks/etc.

One of the few remaining Mk1 owners... #00015