Use the loop device and losetup commands to create a hard disk image

1. Create an image file

Use the following command to create the image file SDB. IMG, BS to specify the block size, and the image file size is Bs * count

Dd If =/dev/Zero of = SDB. img bs = 512 COUNT = 16384

2. Use the losetup command to associate the generated image file with the loop device.

Run the following command to associate the SDB. IMG image file with the/dev/loop0 device:

Losetup/dev/loop0 SDB. img

3. Use the fdisk command to partition the newly associated loop device.

Run the following command to partition the/dev/loop0 device:

Fdisk/dev/loop0

4. Create a file system for each partition

1) associate each partition with a new loop device

Use the following command to associate the loop1 device with the first shard of the loop0 device. xxxx specifies the starting position (in bytes) of the First shard in the loop0 device ):

Losetup-O xxxx/dev/loop1/dev/loop0

Connect the loop2 device to the second partition.

Losetup-O yyyy/dev/loop2/dev/loop0

2) run the mkfsxxx command to create a file system for the loop1 and loop2 devices.

For example, mkfs. ext4/dev/loop1

5. Mount two shards in the loop0 Device

Run the following command to mount two partitions:

Mount/dev/loop1/mnt/sdc1