ESXi 5.5 on HP ProLiant DL380 G7 Server
Solution 1:
There no way to pass raw disks through to an OS while connected to an HP server backplane that's linked to an onboard RAID controller (the Smart Array P410 in your case). You must create a "Logical Drive" in order to present a block device to ESXi.
To see RAW disks in this situation, you'd need a dedicated SAS HBA like an LSI 9211-8i to be connected to the server's drive backplane.
Can you tell us more about what you're trying to do? RAW unraided disks, SATA 2.5" drives, VMware ESXi and a high-end machine smells like a troubling combination to me.