Shrouding For L/UL Drives
Original Publication Date: 2002-May-18
Included in the Prior Art Database: 2003-Jun-18
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. HSA SHROUDING 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.