Power Edge 720 HDD

We have a PowerEdge R720 server (Service Tag DXXXXX1) being used for our EMR system.  Yesterday we started getting a predicted failure on one of the physical disks (Span 0 Physical Disk 0:1:1).  We ordered the new Dell drive (Part Number w347k is what I was told by triage to order) to replace this drive.  According to the System Management it states "HOT SWAP ... NO".  Does this mean the drive is not hot swappable???  I am confused because all the drives on all of our Dell PowerEdge Servers should be hot swappable, as we cannot shut these serves down.