A slight nudge, a power surge, or a contaminant introduced into the drive may cause the head to touch the platter.
Advice should have been obtained on how much contaminant might suffice to infect.
Beware of bargains, as cutting corners to keep costs low may mean the introduction of some nasty contaminant you definitely don't want.
But in the field, nothing much happened beyond wishful thinking, contaminant dilution and perhaps inadvertent nutrient addition.
Common sorrel seed has occurred as a contaminant of grass seed mixtures, crop seeds and in hay.
In general, contaminant inputs have declined and elevated concentrations are often a legacy of former industrial discharges.
Next was a large bin full of powder which would be sprinkled on the suit to dry up any chemical contaminant.
Results from the site investigations indicated that contaminant plumes existed within part of the site.
Some scientists suspect that a certain contaminant may be linked to the pet food supplier.