HB> Thanks Jeff. IOCTL is a little (a LOT) beyond my league at the moment :(

 // sample C program to eject cdrom.
 // Shows 1) How to open a physical disk in "DASD" mode
 //       2) How to use an IOCTL.
 #include 
 #include 
 #include 
 #define INCL_DOS
 #define INCL_DOSDEVIOCTL
 #define INCL_NOPMAPI
 #include 

 HFILE opendrive(char *drstr, char mode)
 {
     HFILE fh;
     ULONG usAction, stat;
     ULONG open_mode;
     ULONG bCmd;

     open_mode = OPEN_FLAGS_DASD | OPEN_SHARE_DENYREADWRITE
                 | OPEN_FLAGS_WRITE_THROUGH | OPEN_FLAGS_FAIL_ON_ERROR
                 | OPEN_FLAGS_NOINHERIT;

     if(mode == 'w')
         open_mode |= OPEN_ACCESS_READWRITE;

     stat = DosOpen(drstr,      /* filename to open              */
         &fh,                   /* address of file handle        */
         &usAction,             /* address to store action taken */
         0L,                    /* size of new file              */
         0,                     /* file's attribute              */
         FILE_OPEN,             /* action to take if file exists */
         open_mode,             /* file's open mode              */
         0L);                   /* Reserved                      */
     if(stat){
         switch(stat){
             case 15:
                 printf("Drive %s is invalid.\n", drstr);
                 break;
             case 21:
                 printf("Drive %s is not ready.\n", drstr);
                 break;
             case 32:
                 printf("Drive %s is currently locked by another
process.\n", drstr);
                 break;
             case 65:
                 printf("Drive %s is a network drive.\n", drstr);
                 break;
             default:
                 printf("error %d opening drive %s\n", stat, drstr);
         }
         exit(3);
     }
     return(fh);
 }

 int main(void)
 {
     HFILE hf;
     APIRET rc;
     ULONG ulPinout, ulDinout;
     LONG ID_code;

     hf = opendrive("J:", 'r');

     ulPinout = sizeof(ID_code);
     ulDinout = 0;

     // the ID_code is what most people miss. It must be "CD01"
     ID_code = 0x31304443L;    // "CD01"

     rc = DosDevIOCtl(hf,
                     IOCTL_CDROMDISK,
                     CDROMDISK_EJECTDISK,
                     &ID_code, sizeof(ID_code), &ulPinout,     /* parms */
                     NULL, 0, &ulDinout);                /* data */

     if(rc)
         printf("sys%04u: CDROMDISK_EJECTDISK error\n", rc);
     exit(0);
 }



--- Maximus/2 3.00