Besides the mounting of disks via USB, the Banana Pi provides a SATA interface. This interface provides greatly improved performance compared to USBs for hard disk drives (HDD) or solid state disks (SSD).
This recipe requires the following ingredients:
A Banana Pi
USB power supply unit
An SD card containing a Linux distribution
A hard disk drive or solid state drive
A SATA-to-SATA cable and a SATA power supply for your drive or SATA cable with power supply terminals
Access to the Banana Pi's shell
All these products can be bought from retailers. The SATA cable with power supply terminals is quite rare. You might search for that item on online stores that specialize in single-board computers. If you search for Banana Pi SATA cable with power terminals or similar on your desired search engine, you will find retailers for that product.