how to check where the ESX i 4.1 is installed

Hi,

Greetings,

We are in a process of upgrading ESXi 4.1 to ESXi 5. while going through the ESXi 4.1, not able to see the local VMFS datastore of that ESXi server, but if i go though the storage adapter under smart array E200i adapter i am able to see the local disk ( not VMFS format). i am guessing the the ESXi has been installed on SD card or on USB drive. how can i check whether the ESXi installation is on USB or SD card?

Other query

1) if its on SD card or USB drive, how should i do the upgrade?

2) if i choose to reinstall ESXi 5.0 on local disks, how should i take backup and restore it?

Thanks in advance,,