Abstract
The range of PSA/RSA (slider pitch/roll static attitude respectively) devoid of head–disk contact during ramp loading is called “sweet-spot”. Its extent was measured for different air-bearing designs and loading variables. The sweet spot boundaries are determined both by the air bearing and “body-effects” invariant of air bearing design. In the latter case, the air-bearing genesis occurs sufficiently far from the disk where detailed ABS differences have little relative transient effect. The available sweet spot is roughly ±1° which is within drive design capability, but requires attention to details. Measuring head/disk contact severity over the sweet spot indicates ranges of PSA/RSA to be stringently avoided (e.g. negative pitch) and those more tolerant of head/disk contact. The sweet spot extent is confirmed with disk damage at the boundaries for 100,000 cycles. A key parameter is loading velocity. Optimum sweet spot occurs with a vertical loading velocity of about 1 inch/sec and diminishes to near-zero at 4 inch/sec. The test technique is described in detail. Sweet spot knowledge in used to predict head–disk contact reliability.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
