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Shrouding For L/UL Drives Disclosure Number: IPCOM000013491D
Original Publication Date: 2002-May-18
Included in the Prior Art Database: 2003-Jun-18
Document File: 1 page(s) / 69K

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Spindle Power Comparison between Load/Unload and Contact Start/Stop Disk Drives

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Shrouding For L/UL Drives

Spindle Power Comparison between Load/Unload and Contact Start/Stop Disk Drives

Implementation of L/UL instead of CSS has power saving consequences for the air flow in a disk drive. With the use of a simple shroud next to the rotating disk pack, substantial power savings can be realized. With the implementation of a shroud, the airflow which normally exits the rotating disk pack on a tangential velocity vector is directed back into the pack by the shroud assembly. This means that the air-flow is less turbulent around the periphery of the disk pack. This allows improved air-flow conditions which mean that an increase of power consumption by about 15% over equivalent CSS drives can be expected. Implementation of an HSA shroud can recover some of this lost power with a very rudimentary shroud design. It can be expected that a more careful design, based on air flow modeling will obtain even better results.


The air flow in a load/unload disk drive can be very different from the air flow in a CSS drive. In particular the area downstream from the HSA is different because of the load unload ramp. Figure 1 shows the CSS configuration. The affected area of shrouding is marked by the numbers.

Figure 1: Contact start-stop disk drive. The numbers indicate the locations of removable parts of the circumferential shrouding.

To restore the airflow as much as possible and to restrict the air from entering the area behind the HSA, an actuator...