ubuntu@ubuntu:~$ ls -l /dev/sda1
brw-rw---- 1 root disk 8, 1 Feb 26 14:11 /dev/sda1
ubuntu@ubuntu:~$ fdisk -l /dev/sda
Cannot open /dev/sda
ubuntu@ubuntu:~$ fdisk -l /dev/sda1
Cannot open /dev/sda1
ubuntu@ubuntu:~$ sudo fdisk -l /dev/sda1
Disk /dev/sda1: 1000.2 GB, 1000202043392 bytes
255 heads, 63 sectors/track, 121600 cylinders, total 1953519616 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x6e697373
This doesn't look like a partition table
Probably you selected the wrong device.
Device Boot Start End Blocks Id System
/dev/sda1p1 ? 1936269394 3772285809 918008208 4f QNX4.x 3rd part
Partition 1 does not start on physical sector boundary.
/dev/sda1p2 ? 1917848077 2462285169 272218546+ 73 Unknown
Partition 2 does not start on physical sector boundary.
/dev/sda1p3 ? 1818575915 2362751050 272087568 2b Unknown
Partition 3 does not start on physical sector boundary.
/dev/sda1p4 ? 2844524554 2844579527 27487 61 SpeedStor
Partition 4 does not start on physical sector boundary.
Partition table entries are not in disk order
ubuntu@ubuntu:~$ sudo fdisk -l /dev/sda
Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x46cd7164
Device Boot Start End Blocks Id System
/dev/sda1 2048 1953521663 976759808 7 HPFS/NTFS/exFAT
ubuntu@ubuntu:~$