Gives the size in bytes of a specified drive SysUtils unit
 function DiskSize ( Drive : Byte ) : Int64;
The DiskSize function gives the size in bytes of the given Drive.
If the drive is invalid, or no media, -1 is returned
If the drive is read-only, 0 is returned.
The Drive is designated as follows:
= A drive
= B drive
= C drive
Related commands
DiskFree Gives the number of free bytes on a specified drive
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Example code : Show the size in bytes of drives B to F on your PC
  i     : Integer;
  space : Int64;

  // Display the free space on drives B, C, D, E, F, where present
  for i := 2 to 6 do
    space := DiskSize(i);

    if space >= 0
    then ShowMessage(Chr(i+64)+' Drive size = '+
                     FloatToStrF(space, ffNumber, 20, 0))
    else ShowMessage(Chr(i+64)+' Drive not present');
Show full unit code
   Example output is as follows:
   B Drive not present
   C Drive size = 11,997,143,040
   D Drive size = 7,995,756,544
   E Drive size = 686,587,904
   F Drive size = 591,429,632
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