sudo fdisk -l

Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x000dcaf7

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1               1        2432    19535008+  fd  Linux raid autodetect
/dev/sda2            2433      121601   957224992+  fd  Linux raid autodetect

Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x97d0702a

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1        2432    19535008+  fd  Linux raid autodetect
/dev/sdb2            2433      121601   957224992+  fd  Linux raid autodetect

Disk /dev/sdd: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x1838265a

   Device Boot      Start         End      Blocks   Id  System
/dev/sdd1               1        2432    19535008+  83  Linux
/dev/sdd2            2433      121601   957224992+  fd  Linux raid autodetect

Disk /dev/sdc: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0xb0530ce4

   Device Boot      Start         End      Blocks   Id  System
/dev/sdc1               1        2432    19535008+  83  Linux
/dev/sdc2            2433      121601   957224992+  fd  Linux raid autodetect

Disk /dev/sde: 2000.4 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x00099f79

   Device Boot      Start         End      Blocks   Id  System
/dev/sde1               1      243201  1953512001   83  Linux

Disk /dev/md1: 2940.6 GB, 2940594880512 bytes
2 heads, 4 sectors/track, 717918672 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Disk identifier: 0x00000000

Disk /dev/md1 doesn't contain a valid partition table

Disk /dev/md0: 20.0 GB, 20003749888 bytes
2 heads, 4 sectors/track, 4883728 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Disk identifier: 0x00000000

Disk /dev/md0 doesn't contain a valid partition table

-------------------------------------------------------------------------------
ubuntu@ubuntu:/mnt/md1$ sudo mdadm -D /dev/md0
/dev/md0:
        Version : 00.90
  Creation Time : Fri Mar  6 19:23:58 2009
     Raid Level : raid1
     Array Size : 19534912 (18.63 GiB 20.00 GB)
  Used Dev Size : 19534912 (18.63 GiB 20.00 GB)
   Raid Devices : 2
  Total Devices : 2
Preferred Minor : 0
    Persistence : Superblock is persistent

    Update Time : Fri Feb 26 03:36:04 2010
          State : clean
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

           UUID : 6e5d04c5:2909e8a2:68c033ef:6098b2cd
         Events : 0.155924

    Number   Major   Minor   RaidDevice State
       0       8        1        0      active sync   /dev/sda1
       1       8       17        1      active sync   /dev/sdb1
----------------------------------------------------------------------
ubuntu@ubuntu:/mnt/md1$ sudo !!
sudo mdadm -D /dev/md1
/dev/md1:
        Version : 00.90
  Creation Time : Fri Apr 24 18:12:28 2009
     Raid Level : raid5
     Array Size : 2871674688 (2738.64 GiB 2940.59 GB)
  Used Dev Size : 957224896 (912.88 GiB 980.20 GB)
   Raid Devices : 4
  Total Devices : 4
Preferred Minor : 1
    Persistence : Superblock is persistent

    Update Time : Sun Feb 28 17:31:45 2010
          State : clean
 Active Devices : 4
Working Devices : 4
 Failed Devices : 0
  Spare Devices : 0

         Layout : left-symmetric
     Chunk Size : 64K

           UUID : fabb8367:38639b0a:b025f78f:25f22869
         Events : 0.179202

    Number   Major   Minor   RaidDevice State
       0       8        2        0      active sync   /dev/sda2
       1       8       18        1      active sync   /dev/sdb2
       2       8       34        2      active sync   /dev/sdc2
       3       8       50        3      active sync   /dev/sdd2