Lenovo ThinkStation P920 Manual page 8

Optionally, in the P720 system, SATA drives can be connected to the onboard
Intel SATA controller via BCA's. This consists of the Blind Connect to SATA cable
and dual BCA-S. The P720 system can support up to 4 drives using the onboard
Intel SATA controller.
The red boxes in the diagram below show the active SATA ports that are available
with the onboard Intel SATA controller.
Blind Connect Assembly (BCA) Option
BCA 3
BCA 3
S/X 1
S/X 2
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