{TAIL ~ The first circuit card} also includes circuitry which allows hot plugging of the hard disk drive to the bus of the computer and which also acts as {HEAD ~ a lockout} to prevent writing to the removable hard disk drive until after the computer system has been rebooted 
{ TAIL ~ The first circuit card } also includes circuitry which allows hot plugging of the hard disk drive to the bus of the computer and which also acts as { HEAD ~ a lockout } to prevent writing to the removable hard disk drive until after the computer system has been rebooted
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