Dear customer, please note that items Western Digital WD Red Pro 20TB 3.5' NAS HDD SATA3 7200RPM 512MB Cache 24x7 300TBW ~24-bays NASware 3.0 CMR Tech 5yrs wty are currently listed as pre-order/on order. You can continue to place a backorder and it will ensure earliest allocation when these products are available. Our team will contact you to notify the expected ETA. Thank you.