what is dm-0 under /dev ?

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Dear all

I have installed FC-13 on 10gb hdd it works fine,  but when I run fdisk 
-l command , I got the following[1] result.... I don't know what is dm-0 
device under the /dev ...

can anyone explain me

[1]-----------------------------------------
  [root@lab1 ~]# fdisk -l

Disk /dev/sda: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000cc564

    Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          64      512000   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2              64          96      256000   82  Linux swap / Solaris
Partition 2 does not end on cylinder boundary.
/dev/sda3              96        1306     9716736   8e  Linux LVM

Disk /dev/sdb: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Disk /dev/sdb doesn't contain a valid partition table

Disk /dev/dm-0: 9932 MB, 9932111872 bytes
255 heads, 63 sectors/track, 1207 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Disk /dev/dm-0 doesn't contain a valid partition table
----------------------------------------------------------------------------------------------------

Warm Regards

-- 
   °v°
  /(_)\
   ^ ^  Jatin Khatri
Registerd Linux user No #501175
www.counter.li.org
No M$

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