cat /proc/partitions
major minor  #blocks  name

   8        0 2930266584 sda
   8        1     512000 sda1
   8        2  372669440 sda2
   8        3  409600000 sda3
   8        4 1364700160 sda4
   8       16 1953514584 sdb
   8       17          1 sdb1
   8       21 1953506520 sdb5

bash-4.2# fdisk -l

WARNING: GPT (GUID Partition Table) detected on '/dev/sda'! The util fdisk doesn't support GPT. Use GNU Parted.


Disk /dev/sda: 3000.6 GB, 3000592982016 bytes
255 heads, 63 sectors/track, 364801 cylinders, total 5860533168 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: 0xf82d9516

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     1026047      512000    7  HPFS/NTFS/exFAT
/dev/sda2         1026048   746364927   372669440    7  HPFS/NTFS/exFAT
/dev/sda3      3475765248  4294965247   409600000    7  HPFS/NTFS/exFAT
/dev/sda4       746364928  3475765247  1364700160   83  Linux

Partition table entries are not in disk order