Did you try to install ESXi on the disk after the partition was lost or before that?
Run the below command and let me know the result (it might take a while - few hours may be...)
hexdump -C /dev/disks/t10.ATA_____WDC_WD6000HLHX2D01JJPV0_______________________WD2DWXG1EB0DXH92 | grep "0d d0 01 c0 05"