Coridon Henshaw wrote in a message to Peter Fitzsimmons:

 PF>     rc = DosDevIOCtl(CDHandle,
 PF>                      0x80,              // IOCTL_CDROMDISK
 PF>                      0x44,              // CDROMDISK_EJECTDISK

 CH> 

 CH> What's the point of doing this when you can use category 8
 CH> function 0x40? 

They are translated to exactly the same function inside OS2CDROM.DMD. 
However, the CD-ROM IOCtl category gives a somewhat easier and more
full-featured interface in the general case.  For example (see my earlier
message on this), the CD-ROM IOCtl category has a function to close the
tray, which ends up being translated to a "Start Unit" command to
the device.  There is no analogous function for the Logical Disk IOCtl
category (8).
 
-- Mike


---