PRODUCTION METHOD FOR GLASS SUBSTRATE FOR HDD, GLASS SUBSTRATE FOR HDD, MAGNETIC RECORDING MEDIUM FOR HDD, AND CLEANING CARRIER USED IN PRODUCTION METHOD FOR GLASS SUBSTRATE FOR HDD

摘要

In a cleaning step in a production method for a glass substrate for an HDD, the replacement rate for cleaning fluid inside a cleaning tank is increased while the glass substrate is stably held in a cleaning carrier. The production method for the glass substrate for the HDD includes the cleaning step in which the glass substrate is cleaned by housing the glass substrate in the cleaning carrier (20), placing the cleaning carrier (20) in the cleaning tank, and sending cleaning fluid inside the cleaning tank. In the cleaning step, the cleaning carrier (20) having a pair of side walls (24) mutually facing at the side of the glass substrate housed in the cleaning carrier (20) is used, an opening (29) is provided in the side walls (24) of the cleaning carrier (20), the cleaning fluid is sent inside the cleaning tank in a direction that passes through the side walls (24) of the cleaning carrier (20), and the flow rate of the cleaning fluid that passes through the cleaning tank is 20-70 L/min.