Which SATA connector should the primary hard drive be connected to on the system board?
The primary Serial ATA (SATA) hard drive must be connected to the dark blue primary SATA connector on the system board labeled SATA0. Connecting the primary hard drive to any other connector may cause hard drive performance problems. Secondary hard drives and optical drives should be connected to the light blue SATA connectors labeled SATA1 and SATA2. (Page 33)
From the official HP Elitedesk 800 G2 Small Form Factor PC manual, page 33
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