You're right about the connecting sequence - all things being equal
"SATA1" (very probably printed next to the connector on the
motherboard, but you might need a magnifying glass and a torch) will
be master, however in the BIOS of my motherboard in addition to being
able to change the sequence of devices to select for boot, once you
have selected 'HDD' you can *also* change the sequence of the
connected HDD drives, so on my machine the master could be anything
from SATA1 to SATA6...
'In letters of gold, on a snow-white kite, I will write "I Love You!"
And send it soaring high above you, for all to read!'