#hard drive
If I am not mistaken, the quick blip of the drive is caused by the
disk-validator rewriting the BAM as it has changed now. I dont think it has
anything to do with parking the head. If you write to the harddrive and
warmboot before this little blip, you will notice that after mounting, the
validator must scan through the entire disk since the Bam is marked as
invalid at this point- this takes quite some time- that is why you must wait
for the second blip!!!