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copied!<p>Device numbers used to identify block devices. A kernel thread may be spawned to handle a particular device.</p> <p>(On one of my systems, block devices are currently numbered as shown below. They may change from boot to boot or hotplug to hotplug.)</p> <pre> $ grep ^ /sys/class/block/*/dev /sys/class/block/dm-0/dev:254:0 /sys/class/block/dm-1/dev:254:1 /sys/class/block/dm-2/dev:254:2 /sys/class/block/dm-3/dev:254:3 /sys/class/block/dm-4/dev:254:4 /sys/class/block/dm-5/dev:254:5 /sys/class/block/dm-6/dev:254:6 /sys/class/block/dm-7/dev:254:7 /sys/class/block/dm-8/dev:254:8 /sys/class/block/dm-9/dev:254:9 /sys/class/block/loop0/dev:7:0 /sys/class/block/loop1/dev:7:1 /sys/class/block/loop2/dev:7:2 /sys/class/block/loop3/dev:7:3 /sys/class/block/loop4/dev:7:4 /sys/class/block/loop5/dev:7:5 /sys/class/block/loop6/dev:7:6 /sys/class/block/loop7/dev:7:7 /sys/class/block/md0/dev:9:0 /sys/class/block/md1/dev:9:1 /sys/class/block/sda/dev:8:0 /sys/class/block/sda1/dev:8:1 /sys/class/block/sda2/dev:8:2 /sys/class/block/sdb/dev:8:16 /sys/class/block/sdb1/dev:8:17 /sys/class/block/sdb2/dev:8:18 /sys/class/block/sdc/dev:8:32 /sys/class/block/sdc1/dev:8:33 /sys/class/block/sdc2/dev:8:34 /sys/class/block/sdd/dev:8:48 /sys/class/block/sdd1/dev:8:49 /sys/class/block/sdd2/dev:8:50 /sys/class/block/sde/dev:8:64 /sys/class/block/sdf/dev:8:80 /sys/class/block/sdg/dev:8:96 /sys/class/block/sdh/dev:8:112 /sys/class/block/sdi/dev:8:128 /sys/class/block/sr0/dev:11:0 /sys/class/block/sr1/dev:11:1 /sys/class/block/sr2/dev:11:2 </pre>

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