Power off the Lenovo M710s and unplug the power cord
Remove the side cover
Check for an available 2.5-inch or 3.5-inch drive bay
Check for an unused SATA data port on the motherboard
Check for an unused SATA power connector from the power supply
If needed, install a drive bracket or caddy for the second drive
Mount the second drive in the available bay
Connect a SATA data cable from the drive to the motherboard
Connect a SATA power cable from the power supply to the drive
Reinstall the side cover
Plug the power cord back in and power on the system
Enter BIOS or Windows Disk Management to verify the drive is detected
Initialize, partition, and format the drive if required