Yes, the bottom HDD cage from the Define R4 will fit next to the other HDD cages in these models:


Arc Midi R2

Arc XL

Define R4

Define XL R2


The cage will fit on the 140mm fan slot mounting holes and there will be less space for mounting a power supply. 

The distance from the back of the case and to the additional HDD cage will be:


210mm in: 

Arc XL

Define XL R2


180mm in: 

Define R4 

Arc Midi R2


We recommend mounting power supplies slightly shorter than the measured distance in order to fit the cables on the power supply.