The primary connectors for interfacing HD MiniSAS cables are the SFF-8644 (External), SFF-8643 (Internal) connectors.
The High-Density interface uses less PCB real estate while doubling Data-Rates from 6Gb/s to 12Gb/s and Bandwidth compared to the previous version of Mini-SAS.
Typical applications would be a SAS link between a SAS HBA to a SAS drive subsystem or storage array.
CS Electronics has also incorporated these 12G HD Mini-SAS connectors on I/O & Drive adapters.