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USB
Hard disk
vg_host1
lv4
lv3
lv0
lv1
lv2
Logical
Volume
Manager
Internal
disk
Partition
On internal
disk
Physical Volumes
(block devices)
Volumes Groups
vg_host0
Logical Volumes
(appear like
block devices)
ext3
ext3
fat16
ext3
ext3
File system