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Is it possible to make a part of a block device to be seen as a separate block device (in a similar way block 'devices' are created for partitions)? Unfortunately, I can't mount it through loop device due to poor performance. Also, I can't add a partition table to the disk. Hardcoding necessary information into the kernel is a possible option if someone shows where to put what.

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Use addpart (from util-linux) to tell the kernel about partitions on a device.

SYNOPSIS
   addpart device partition start length

DESCRIPTION
   addpart is a program that informs the Linux kernel of new par‐
   tition.

   This command doesn't manipulate partitions on hard drive.

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