Patent ID: 6580266
Filing Date: 2003-06-17
Classification: G01R,G11B,Y10T

Abstract:
An apparatus including:a spindle for rotatably supporting a disk with thin film material deposited on a substrate; a read/write head movably connected to a first motor that selectably positions the read/write head in flying position over the surface of the disk; a burnishing head movably connected to a second motor that selectably positions the burnishing head in flying position over the surface of the disk; and a test controller which conducts a first magnetic test using the read/write head and the first motor on selected areas of the thin film material to find failures and records first test results including information on locations of the failures, flies the burnishing head over the disk surface subsequent to the first magnetic test to mechanically impact areas of the disk surface which have the thin film material protruding upward from the surface of the disk, conducts a second magnetic test on the selected areas of the thin film material subsequent to burnishing to find failures and obtain second test results, compares the first test results with the second test results to identify failures in the second test results which were not present in the first test results to obtain burnish induced failures and uses the read/write head to write identifiable magnetic information on the disk near each burnish induced failure to aid in subsequent location of the failure.