A:AnswerSupports 6 drives of the motherboard.
2x 2.5"/3.5"
4x 2.5"
Check out the MSI - MPG GUNGNIR 110R ATX Mid-Tower Case - This is what's used and has all the case details.
A:AnswerFor reference - 7 rear USB-A (4 USB 2.0, 3 USB 3.1), 2 front USB-A (3.1). Both front and rear have a USB-C ports as well. The board in use on the PC is: https://www.msi.com/Motherboard/B550-A-PRO so you can see the ports and layout in great detail there!