Balance 2500 (BPL-2500) - SATA 2.5″/3.5″ (HDD/SSD) cable

Hi there !

Just wonder why the BPL-2500 router is delivered with a SATA 2.5″/3.5″ (HDD/SSD) cable?
Is there an HDD slot ?
Where to connect this cable on the device?
Is this device Content Caching capable ?

Sorry for so many questions, but it looks like I missed something…

Thanks in advance for your feedbacks !