1. Variables and constants
2. Procedures and functions

1. Variables and constants
 

There are two types of consants: dtXXXX constants and uvXXXX consants. The dtXXXX constants are returned by the GetDriveType function. The uvXXXX constants just tell you which version of the unit do you use. The constants are declared as follows:

const
  dtError      = $00; { Invalid drive, letter not assigned }
  dtFixed      = $01; { Fixed drive }
  dtRemovable  = $02; { Removable (floppy, etc.) drive }
  dtPhantom    = $03; { Phantom of another drive }
  dtRemote     = $04; { Remote (network) drive }
  dtCDROM      = $05; { MSCDEX V2.00+ driven CD-ROM drive }
  dtDblSpace   = $06; { DoubleSpace compressed drive }
  dtSUBST      = $07; { SUBST'ed drive }
  dtRAM        = $08; { RAM drive }

  uvRelease  = 0;     { release number }
  uvRevision = 8;     { revision number (also means the number of drive
                      types which can be detected }
  uvPatch    = 3;     { patch number }
  uvComment  = 'b';   { 'a'=alpha version, 'b'=beta version,... nothing
                      means: it should work correctly }
 

2. Procedures and functions
 

Function GetDriveType

Declaration:
function GetDriveType (Drive: byte): byte;

Description:
Returns one of the dtXXXX constants for drive defined by parameter Drive (values: 0=current, 1=A, 2=B, 3=C, and so on...).

Function GetNumOfDrives

Declaration:
function GetNumOfDrives : byte;

Description:
Returns the number of valid drives (max. 26).

Function PhantomOfDrive

Declaration:
function PhantomOfDrive (Drive: byte): byte;

Description:
If Drive (values: 0=current, 1=A, 2=B, 3=C, and so on...) is a phantom drive (check it before with GetDriveType for sure) then it returns the number of drive which is it assigned to (1=A, 2=B, and so on...) else it returns zero.

Function GetCurrentDrive

Declaration:
function GetCurrentDrive: byte;

Description:
Returns the currently set drive (1=A, 2=B, and so on...).

Procedure SetCurrentDrive

Declaration:
procedure SetCurrentDrive (Drive: byte);

Description:
If Drive is a valid drive then it sets it as the current drive else it does nothing.