A:Answer Motherboard has 2 additional available SATA headers as well as a 6 pin mini atx header to supply power. Case does not include mounting brackets/caddies for additional hdd/ssd, though there is plenty of space. I added an SDD and an HDD using the existing SATA power plug that came in the case (available) and an SATA power splitter, rather than using the 6 pin mini atx power header. Drives are not attached to the case with rails, brackets or mounts as I have not been able to locate a part I can buy for this purpose.