To increase solderability and protect the disk surface, {HEAD ~ the disks} can be plated with tin or {TAIL ~ an equivalent material} 
To increase solderability and protect the disk surface , { HEAD ~ the disks } can be plated with tin or { TAIL ~ an equivalent material }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL