Is there a command to view hard drive specs

smartctl command from smartmontools package is what you want for that

% sudo smartctl -i /dev/sda
smartctl 6.2 2013-07-26 r3841 [i686-linux-3.13.0-24-generic] (local build)
Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Family:     SAMSUNG SpinPoint M7
Device Model:     SAMSUNG HM250HI
Serial Number:    <snip>
LU WWN Device Id: 5 0024e9 203520f1d
Firmware Version: 2AC101C4
User Capacity:    250,059,350,016 bytes [250 GB]
Sector Size:      512 bytes logical/physical
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   ATA8-ACS T13/1699-D revision 6
SATA Version is:  SATA 2.6, 3.0 Gb/s
Local Time is:    Thu May 15 21:49:09 2014 MYT
SMART support is: Available - device has SMART capability.
SMART support is: Enabled

You can use lshw tool :

Install :

sudo apt-get install lshw 

Command for H.D.D Specs:

lshw -class disk -class storage

% sudo hdparm -I /dev/sda                                                                      ~

/dev/sda:

ATA device, with non-removable media
        Model Number:       WDC WD10JPCX-24UE4T0                    
        Serial Number:      WD-WXR1E24A7U0E
        Firmware Revision:  01.01A01
        Transport:          Serial, SATA 1.0a, SATA II Extensions, SATA Rev 2.5, SATA Rev 2.6, SATA Rev 3.0
Standards:
        Supported: 9 8 7 6 5 
        Likely used: 9
Configuration:
        Logical         max     current
        cylinders       16383   16383
        heads           16      16
        sectors/track   63      63
        --
        CHS current addressable sectors:   16514064
        LBA    user addressable sectors:  268435455
        LBA48  user addressable sectors: 1953525168
        Logical  Sector size:                   512 bytes
        Physical Sector size:                  4096 bytes
        Logical Sector-0 offset:                  0 bytes
        device size with M = 1024*1024:      953869 MBytes
        device size with M = 1000*1000:     1000204 MBytes (1000 GB)
        cache/buffer size  = 16384 KBytes
        Nominal Media Rotation Rate: 5400