It a VB5 (SP3) app.. for Win95 and NT..

What API function(s), Constant(s), struct(s) do I need to use for Direct Disk
Access?

I need to be able to access files.. write over them.. i need to write to file
and drive slack.. I also, need to write to a hard drive like it was one big
file (cluster write???)

TIA,
  Harry