There's a bunch actually, as follows:
Code:
Public Declare Function GetDiskFreeSpace _
               Lib "kernel32" _
               Alias "GetDiskFreeSpaceA" _
               (ByVal lpRootPathName As String, lpSectorsPerCluster As Long, _
               lpBytesPerSector As Long, lpNumberOfFreeClusters As Long, _
               lpTotalNumberOfClusters As Long) As Long

Public Declare Function GetDriveType _
               Lib "kernel32" _
               Alias "GetDriveTypeA" _
               (ByVal nDrive As String) As Long

Public Declare Function GetLogicalDriveStrings _
               Lib "kernel32" _
               Alias "GetLogicalDriveStringsA" _
               (ByVal nBufferLength As Long, ByVal lpBuffer As String) As Long

Public Declare Function GetVolumeInformation _
               Lib "kernel32" _
               Alias "GetVolumeInformationA" _
               (ByVal lpRootPathName As String, ByVal lpVolumeNameBuffer As String, _
               ByVal nVolumeNameSize As Long, lpVolumeSerialNumber As Long, _
               lpMaximumComponentLength As Long, lpFileSystemFlags As Long, _
               ByVal lpFileSystemNameBuffer As String, ByVal nFileSystemNameSize As Long) _
               As Long

Public Declare Function QueryDosDevice _
               Lib "kernel32" _
               Alias "QueryDosDeviceA" _
               (ByVal lpDeviceName As String, ByVal lpTargetPath As String, _
               ByVal ucchMax As Long) As Long
I may be missing some, but these are the main ones.
Hope it helps.