Hello cactus99,   I can confirm for you Part#  RWR8F - HD,2.4T,102E,IS12,2.5,S-SKB,EC  is validated for the R620.   Please let me  know if helps.  
Hello, are hard drives with DP/N 0RWR8F compatible with PowerEdge R620? Thanks!
2.4TB 10K SAS hard drive compatibility