identify hard drive serial number

# hdparm -I /dev/sda | grep Serial
        Serial Number:      WD-WCAL71856931
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# smartctl -a /dev/sda | grep 'Serial Number'
Serial Number:    WD-WCAL71856931
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These utilities are from the hdparm and smartmontools packages:

# dpkg -l | grep hdparm
ii  hdparm                              9.32-1                       tune hard disk parameters for high performance
# dpkg -l | grep smart
ii  smartmontools                       5.39.1+svn3124-2             control and monitor storage systems using S.M.A.R.T.
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