A:Answer Answering this question myself since I purchased a unit and installed an SSD:
Inside the case there is space for 2-3.5" drives, 3 SATA ports, 2-4pin SATA power ports.
Mine included an extra SATA cable and 380Mm Sata Power Cable to power a single SATA device. In order to power another SATA component, I would have to purchase another SATA power cable and SATA data cable that are not included. The SATA power cable is not from the PSU but rather from the motherboard (a special Lenovo 4-pin connector).
I installed a 2.5" SATA SSD 2TB in the 3.5" bay using a converter/mount and it works splendidly with no configuration issues. I have no reason to believe more than 2TB is an issue. Windows recognizes the drive and you can format it as GPT to support very large drives.
I don't know if YMMV on this depending on what parts Lenovo places in your desktop, but everything works splendidly for me and I highly recommend this desktop!