esxcli storage filesystem list Check for unpartitioned space:
esxcfg-volume -l # Identify the partition (e.g., /vmfs/devices/disks/naa.xxx:1) vmkfstools -V --force /vmfs/devices/disks/naa.xxx:1 Or using esxcli: recover vmfs datastore esxi 6 5
partedUtil get /vmfs/devices/disks/naa.xxx If partition table lost, recreate the VMFS partition (data intact): recover vmfs datastore esxi 6 5
partedUtil setptbl /vmfs/devices/disks/naa.xxx gpt \ "1 2048 123456789 AA31E02A400F11DB9590000C2911D1B8 0" Note: This is advanced; ensure correct start/end sectors. Then rescan and mount: recover vmfs datastore esxi 6 5
If the datastore contained critical VMs without backups, consider contacting or a professional data recovery service.