You can install about 4 drives 2x3.5 and 2x2.5 or 1x3.5 and 3x2.5, this is not bad at all for its size. The side walls have visa-free fastenings and this is a kind of feature of this case. The power supply unit will easily fit here up to 150 mm long, but I installed a smaller one so that there is more space and better ventilation.
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