The interposer card is modified to receive {HEAD ~ a docking bay} which receives {TAIL ~ a cartridge} which contains a hard disk drive 
receives
The interposer card is modified to receive { HEAD ~ a docking bay } which receives { TAIL ~ a cartridge } which contains a hard disk drive
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH