Hard Disks
What is a head crash?
p. 358 Fig. 7-16
Next
clearance
read/write head
platter
hair
dust
smoke
ØSpinning
creates cushion of air that floats read/write head above platter
ØOccurs when read/write head touches platter surface
§A smoke particle, dust particle, or human hair could
render drive unusable
§Clearance between head and platter is approximately
two-millionths of an inch