So, do new storage technologies make defragmentation obsolete? The quick and dirty answer is simply: No. File defragmentation is still a vital solution for peak system performance and reliability.
Do New Storage Technologies (SAN/RAID/SATA) Make Defragmentation Obsolete?
https://beausanders.org/whitepapers/Do_New%20_Storage_Technologies%20_SAN-RAID-SATA_Make_Defragmentation_Obsolete.pdf