Look at the "HP MSA 1040/2040 SMU Reference Guide":
Operating systems usually show volume size in base 2. Disk drives usually show size in base 10. Memory (RAM and ROM) size is always shown in base 2. In the SMU, the base for entry and display of storage-space sizes can be set per user. When entering torage-space sizes only, either base-2 or base-10 units can be specified. Base 10 is the default.
http://wintelguy.com/tb2tib.html
5.2 TB = 4.7TiB