Steps to reproduce:

1. Windows Server with multiple filesystem volumes
2. Volumes mounted to a folder path (not assigned a drive letter)
   1. format volume
   2. Add Drive Letter or Path
   3. Mount in the following empty NTFS folder
3. zabbix_get -s localhost -k vfs.fs.discovery
4. JSON only includes logical disks with drive letters assigned

Result:

{
  "data": [
    {
      "{#FSNAME}": "C:",
      "{#FSTYPE}": "NTFS",
      "{#FSDRIVETYPE}": "fixed"
    },
    {
      "{#FSNAME}": "D:",
      "{#FSTYPE}": "UNKNOWN",
      "{#FSDRIVETYPE}": "cdrom"
    }
  ]
}
Expected:

{

  "data": [
    {
      "{#FSNAME}": "C:",
      "{#FSTYPE}": "NTFS,
      "{#FSDRIVETYPE}": "fixed"
    },
    {
      "{#FSNAME}": "C:\\mounts
Data1",
      "{#FSTYPE}": "NTFS,
      "{#FSDRIVETYPE}": "fixed"
    }
  ]
}