Huffington,   The largest SSD I show listed for the R730xd is the 15 TB SAS SSD part number 5WPFT, the next largest looks to be a 7.68 TB SAS SSD part number PD02Y.   Let me know if this helps answer your question.  
Hi, We have a range of Dell R730XDs we are looking to do a disk upgrade for. It's a 26 disk setup with 2.5" backplane. The raid controller is PERC H730P 2GB Lvl 0-60 Mini Mono RAID.What is the maximum disk size for SSDs on this configuration? We could not find any documentation stating this.Thanks!
Max disk (SSD) size on Dell R730XD with PERC H730P