The ExpressCage MB326SP-B fits up to 6 x 2.5” SATA HDD/SSD (5mm - 9.5mm) into
a single external 5.25” bay with the ability to hot swap for easy drive replacement.
The FatCage MB155SP-B allows up to a massive 5 x 3.5” SATA III hard drives, while
only consuming three external 5.25” bays.
source：https://global.icydock.com/resources/product_reviews_1412.html