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Load/Unload Ramp Design with Integrated Bypass Wall

IP.com Disclosure Number: IPCOM000237261D
Publication Date: 2014-Jun-10
Document File: 2 page(s) / 261K

Publishing Venue

The IP.com Prior Art Database

Abstract

For server class HDD applications, the turbulence generated by the HDD internal airflow is a significant contributor to the TMR budget. To improve file performance and reliability, it is important to reduce the turbulence effects for the airflow around the HSA assembly. Two techniques used for turbulence reduction are the dedicated flow bypass channel and the slit shroud.

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Load/Unload Ramp Design with Integrated Bypass Wall

For server class HDD applications, the turbulence generated by the HDD internal airflow is a significant contributor to the TMR budget. To improve file performance and reliability, it is important to reduce the turbulence effects for the airflow around the HSA assembly. Two techniques used for turbulence reduction are the dedicated flow bypass channel and the slit shroud.

The dedicated flow bypass channel directs the upstream highly turbulent airflow away from the HSA assembly region and returns it downstream of the HSA. The bypass channel is designed to have little flow resistance so that the extra motor torque needed to bypass the flow is minimized. For effectiveness and cost saving reasons, it is desirable to have the bypass channel designed into the base casting.

Due to the limited HDD real estate and manufacturing process requirements the bypass channel wall continuity needs to be compromised so that the load/unload ramp can be installed. The violation of bypass wall continuity reduces the effectiveness of both the bypass channel (reduced pressure) and the downstream spoiler L/UL ramp (addition of airflow disturbance from bypass channel leakage).

Integrated bypass wall has previously been successfully integrated with other components (i.e. diverter and slit shroud) in the product line as shown in US Patents 7,898,764 and 8,004,790.

We propose to mitigate the bypass channel discontinuity by designing the ra...