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# hdparm -i /dev/hda

...
 DMA modes: mdma0 mdma1 mdma2 udma0 udma1 *udma2 udma3 udma4
 AdvancedPM=no WriteCache=enabled
 Drive Supports : Reserved : ATA-1 ATA-2 ATA-3 ATA-4

#!/usr/bin/perl

...

print "HDD serial number is: $1\n"
  if $query =~ m/SerialNo=([^,\s]+)/s;

HDD serial number is: WD-WMA2F2556865