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Controls the disk mount conditioner

dmc configures the Disk Mount Conditioner. The Disk Mount Conditioner is a kernel provided service that can degrade the disk I/O being issued to specific mount points, providing the illusion that the I/O is executing on a slower device. It can also cause the conditioned mount point to advertise itself as a different device type, e.g. the disk type of an SSD could be set to an HDD.

source: man