Types of Disk :
SATA : sda, sdb and sdc <-- Disk1 , Disk2 & Disk3 Respectively
PATA (legacy) : hda,hdb and hdc <-- Disk1 , Disk2 & Disk3 Respectively
Partitions : sda1,sda2 and sda3 ⇽- Disk SDA
Partition : hda1,hda2 and hda3 ⇽- Disk HDD
The Total number of partition can be created is Four out of which either all four can be primary or 3 primary and one extended.
This extended partition will have n number of logical partitions.
MBR : Master Boot Recorder is responsible for creation of maximum 4 partitions.
So if you chose to create all partition as primary as max partition in hard disk will be 4.
But if you create 3 Primary and one extended then further max 11 partitions can be build in extended.
Ext2 = RHEL4
ext3 = RHEL5
ext4 = RHEL6
ext5 = RHEL7
Step 1 : list number of disks
[root@RedHat adminji]# fdisk -l
Disk /dev/sdb: 64 GiB, 68719476736 bytes, 134217728 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 label type: GPT
Disk identifier: B8265C8F-141E-4E0B-B7DE-9DE6F75CCF40
Device Start End Sectors Size Type
/dev/sdb1 1026048 2050047 1024000 500M Linux file system
/dev/sdb2 2050048 134215679 132165632 63G Linux LVM
/dev/sdb14 2048 10239 8192 4M BIOS boot
/dev/sdb15 10240 1024000 1013761 495M EFI System
Disk /dev/sda: 4 GiB, 4294967296 bytes, 8388608 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
Disklabel type: dos
Disk identifier: 0x27d11b8e
Device Boot Start End Sectors Size Id Type
/dev/sda1 2048 8386559 8384512 4G 7 HPFS/NTFS/exFAT
Alternate way to find out disk
[root@RedHat adminji]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 4G 0 disk
└─sda1 8:1 0 4G 0 part /mnt
sdb 8:16 0 64G 0 disk
Step 2) Now add one more disk and can see new disk sbc
[root@RedHat adminji]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 4G 0 disk
└─sda1 8:1 0 4G 0 part /mnt
sdb 8:16 0 64G 0 disk
sdc 8:32 0 1T 0 disk
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