LINUX: Command To List Number of Physical Disks (Drives) On Linux Host

Below command can be used

sudo lshw -class disk -short

Below is sample output

#sudo lshw -class disk -short
H/W path          Device      Class          Description
========================================================
/0/100/1.1/0.0.0  /dev/cdrom  disk           CD-ROM
/0/100/d/0.0.0    /dev/sda    disk           107GB VBOX HARDDISK