partedUtil get /dev/disks/naa.YOUR_DISK_ID Or for all:
esxcfg-datastore -u "DatastoreName" Mount: recover vmfs datastore esxi 5
partedUtil get /dev/disks/naa.YOUR_DISK_ID Look for VMFS partition type ( FB ). If partition table lost, recreate first partition starting at sector 128 (typical) or 2048 with VMFS type: partedUtil get /dev/disks/naa