A device for keeping the temperature of plate regions or. Plates in a magnetic disc drive has a helicoidal guide

摘要

A magnetic disc assembly including a system for efficiently maintaining the temperature in the disc compartment at a prescribed operating level. Disc compartment temperature is maintained at a prescribed level elevated above ambient by the combined effect of moving ambient air around a cylindrical convoluted shroud surrounding the disc compartment for cooling and by selectively activating elements within the compartment for heating. The shroud is surrounded by a concentric cylindrical cover and the ambient air flows between the shroud and the cover. The heater elements serve to quickly bring the disc compartment temperature up to the elevated operating level and to add heat as required to maintain that level. The heater elements are incorporated in the compartment within the shroud convolutions and are activated in response to a temperature sensor within the compartment. An ambient air temperature sensor controls the ambient air flow. A disc stack assembly supported in the disc compartment includes a plurality of discs mounted on a common shaft secured to a rotatable hub. In operation, the discs spin very rapidly causing the air within the compartment to move in the same direction as the disc surfaces. A flared baffle mounted within the compartment interrupts the moving air and creates a pressure differential between the upstream and downstream sides of the baffle. This pressure differential is employed to circulate the air within the compartment through a filter.