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physical_block_device
"is a framework provided by the [[리눅스_커널,Linux_kernel]] for mapping [[physical_block_device]]s onto higher-level [[virtual_block_device]]s. It forms the foundation of the logical_volume_manager (LVM), software_RAID s and dm-crypt disk_encryption , and offers additional features such as file system snapshots." { WpEn:Device_mapper = https://en.wikipedia.org/wiki/Device_mapper }