STANDARD RECIRCULATION FILTER (SRF)0 pages
gl Donaldson.
nnnnÏSM FILTRATION SOLUTIONS
nnnnSTANDARD RECIRCULATION
nnnnFILTER (SRF)
nnnnDisk Drive
nnnnDESCRIPTION
nnnnThe Standard Recirculation Filter (SRF)
nnnnis comprised of an electrostatic filtration
nnnnmedia encapsulated between two layers of
nnnnprotective scrim.
nnnnPRINCIPLE OF OPERATION
nnnnThe SRF is designed to provide protection
nnnnfrom particles. The high efficiency, low
nnnnpressure drop construction provides
nnnnoptimized particle clean-up performance.
nnnnINSTALLATION IN DRIVE
nnnnThe SRF is located directly in the path
nnnnof the airflow generated by the rotating
nnnndisks. In a hard disk drive, this location is
nnnntypically opposite the read/write arm. The
nnnninstallation of the filter into the drive can
nnnnbe accomplished by several techniques.
nnnnThe most common method is to insert the filter into a
nnnnholder integral to the base casting. Alternative methods
nnnninclude inserting the filter into a slot in a plastic bracket or
nnnnultrasonically welding the filter to the plastic bracket. The
nnnnplastic bracket, in turn, is custom designed to fit into the
nnnnbase casting.
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