diff --git a/libisoburn/trunk/libisoburn/burn_wrap.c b/libisoburn/trunk/libisoburn/burn_wrap.c
index 19788789..8a5d4d50 100644
--- a/libisoburn/trunk/libisoburn/burn_wrap.c
+++ b/libisoburn/trunk/libisoburn/burn_wrap.c
@@ -53,15 +53,26 @@ static int isoburn_welcome_media(struct isoburn **o, struct burn_drive *d,
  ret= burn_disc_get_multi_caps(d, BURN_WRITE_NONE, &caps, 0);
  if(ret<=0)
    goto ex;
+ ret= isoburn_new(o, 0);
+ if(ret<=0)
+   goto ex;
+ (*o)->drive= d;
  if(caps->start_adr) {         /* set emulation to overwriteable */
-   ret= isoburn_new(o, 0);
-   if(ret<=0)
-     goto ex;
    (*o)->emulation_mode= 1;
-   (*o)->drive= d;
    ret= isoburn_start_emulation(*o, 0);
-   if(ret<=0)
+   if(ret<=0) {
+     (*o)->emulation_mode= -1;
      goto ex;
+   }
+ } else {
+
+   /* >>> recognize unsuitable media */;
+
+ }
+ ret = isoburn_read_volset(*o);
+ if(ret<=0) {
+   (*o)->emulation_mode= -1;
+   goto ex;
  }
  ret= 1;
 ex:
@@ -72,48 +83,69 @@ ex:
 
 
 int isoburn_drive_scan_and_grab(struct burn_drive_info *drive_infos[],
-                                char* adr, int load)
+                                char *adr, int load)
 {
- int ret;
+ int ret, treatment= 0;
  struct stat stbuf;
- char libburn_drive_adr[BURN_DRIVE_ADR_LEN];
+ char libburn_drive_adr[BURN_DRIVE_ADR_LEN], *adrpt, *stdio_adr= NULL;
  struct isoburn *o= NULL;
 
- ret= burn_drive_convert_fs_adr(adr, libburn_drive_adr);
- if(ret<0)
-   return(ret);
- if(ret==0) {
-   if(stat(adr,&stbuf)!=-1) {
+ adrpt= adr;
+ if(strncmp(adr, "grow:", 5)==0) {
+   treatment= 1;
+   adrpt+= 5;
+   if(stat(adrpt,&stbuf)!=-1)
      if(S_ISREG(stbuf.st_mode) || S_ISBLK(stbuf.st_mode)) {
-       ret= burn_drive_grab_dummy(drive_infos, adr);
-       if(ret<=0)
-         return(ret);
-       o->emulation_mode= 2; /* standard i/o */
-     } else {
-
-       /* >>> unsuitable file type */;
-     
-       return(0);
+       stdio_adr= calloc(strlen(adrpt)+6+1, 1);
+       if(stdio_adr==NULL)
+         {ret= -1; goto ex;}
+       sprintf(stdio_adr, "stdio:%s", adrpt); /* use pseudo-drive */
+       adrpt= stdio_adr;
      }
-   } else {
+ } else if(strncmp(adr, "modify:", 7)==0) {
+   treatment= 2;
+   adrpt+= 7;
+ }
+ ret= burn_drive_convert_fs_adr(adrpt, libburn_drive_adr);
+ if(treatment==0) {
+   if(ret>0)
+     treatment= 1;
+   else
+     treatment= 2;
+ } else if(treatment==1 && ret<=0) {
 
-     /* >>> file not found */;
+   /* >>> unsuitable media */;
 
-     return(0);
-   }
- } else {
-   ret= burn_drive_scan_and_grab(drive_infos, adr, load);
+    ret= 0; goto ex;
+ }
+ o->treatment= treatment;
+
+ if(treatment==1) {
+   ret= burn_drive_scan_and_grab(drive_infos, adrpt, load);
    if(ret<=0)
      goto ex;
    ret= isoburn_welcome_media(&o, (*drive_infos)[0].drive, 0);
    if(ret<=0)
      goto ex;
+ } else {
+   if(stat(adrpt,&stbuf)!=-1)
+     if(! S_ISREG(stbuf.st_mode)) {
+
+       /* >>> unsuitable target for modify */;
+
+       ret= 0; goto ex;
+     }
+
+   /* >>> welcome file for modfication treatment */;
+
  }
 
  ret= 1;
 ex:
  if(ret<=0)
    isoburn_destroy(&o,0);
+ if(stdio_adr!=NULL)
+   free(stdio_adr);
  return(ret);
 }
 
@@ -237,98 +269,22 @@ int isoburn_disc_track_lba_nwa(struct burn_drive *d,
 
 void isoburn_disc_write(struct burn_write_opts *opts, struct burn_disc *disc)
 {
+ int ret, multi= 1;
+ struct isoburn *o;
+ struct burn_drive *drive;
+
+ drive= burn_write_opts_get_drive(opts);
+ ret= isoburn_find_emulator(&o, drive, 0);
+ if(ret<0)
+   return;
+ if(o!=NULL)
+   if(o->emulation_mode!=0)
+     multi= 0;
+ burn_write_opts_set_multi(opts, multi);
  burn_disc_write(opts, disc);
 }
 
 
-#ifdef NIX
-
-int isoburn_random_access_write(struct burn_drive *d, off_t byte_address,
-                                char *data, off_t data_count, int flag)
-{
- int ret, mode = O_RDWR | O_LARGEFILE | O_CREAT;
- struct isoburn *o;
-
- ret= isoburn_find_emulator(&o, d, 0);
- if(ret<0)
-   return(0);
- if(o->emulation_mode==2) {
-   if(flag&1)
-     mode|= O_SYNC;
-   o->stdio_fd= open(o->stdio_path, mode);
-   if(o->stdio_fd==-1) {
-
-     /* >>> cannot open stdio_path */;
-     return(0);
-   }
-   if(lseek(o->stdio_fd, byte_address, SEEK_SET)==-1) {
-
-     /* >>> cannot reach given byte_address  */;
-     ret= 0; goto close_stdio;
-   }
-   if(write(o->stdio_fd, data, data_count) != data_count) {
-
-     /* >>> cannot write desired number of bytes */;
-     ret= 0; goto close_stdio;
-   }
-   
-   ret= 1;
-close_stdio:;
-   close(o->stdio_fd); o->stdio_fd= -1;
- } else if(o->emulation_mode==-1)
-   ret= 0;
- else
-   ret= burn_random_access_write(d, byte_address, data, data_count, flag);
- return(ret);
-}
-
-
-int burn_read_data(struct burn_drive *d, off_t byte_address,
-                   char data[], off_t data_size, off_t *data_count, int flag)
-{
- int ret, mode = O_RDONLY | O_LARGEFILE;
- off_t count, todo;
- struct isoburn *o;
-
- ret= isoburn_find_emulator(&o, d, 0);
- if(ret<0)
-   return(0);
- if(o->emulation_mode==2) {
-   o->stdio_fd= open(o->stdio_path, mode);
-   if(o->stdio_fd==-1) {
-
-     /* >>> cannot open stdio_path */;
-     return(0);
-   }
-   if(lseek(o->stdio_fd, byte_address, SEEK_SET)==-1) {
-
-     /* >>> cannot reach given byte_address  */;
-     ret= 0; goto close_stdio;
-   }
-   for(todo= data_size; todo>0; ) {
-     count= read(o->stdio_fd, data+(data_size-todo), todo);
-     if(count<=0)
-   break;
-     todo-= count;
-   }
-   if(todo>0) {
-
-     /* >>> cannot read desired number of bytes */;
-     ret= 0; goto close_stdio;
-   }
-   ret= 1;
-close_stdio:;
-   close(o->stdio_fd); o->stdio_fd= -1;
- } else if(o->emulation_mode==-1)
-   ret= 0;
- else
-   ret= burn_read_data(d, byte_address, data, data_size, data_count, flag);
- return(ret);
-}
-
-#endif /* NIX */
-
-
 void isoburn_drive_release(struct burn_drive *drive, int eject)
 {
  int ret;
@@ -380,7 +336,7 @@ void isoburn_write_opts_set_start_byte(struct burn_write_opts *opts,
  
  drive= burn_write_opts_get_drive(opts);
  ret= isoburn_find_emulator(&o, drive, 0);
- if(ret<=0)
+ if(ret<=0) /* no emulation, no burn_write_opts_set_start_byte() */
    goto ex;
  ret= burn_disc_get_multi_caps(drive, BURN_WRITE_NONE, &caps, 0);
  if(ret<=0)
diff --git a/libisoburn/trunk/libisoburn/isoburn.c b/libisoburn/trunk/libisoburn/isoburn.c
index f512955e..3b4a15ea 100644
--- a/libisoburn/trunk/libisoburn/isoburn.c
+++ b/libisoburn/trunk/libisoburn/isoburn.c
@@ -49,12 +49,7 @@ int isoburn_new(struct isoburn **objpt, int flag)
  o->emulation_mode= 0;
  o->min_start_byte= 0;
  o->nwa= 0;
-
-#ifdef NIX
- o->stdio_path= NULL;
- o->stdio_fd= -1;
-#endif /* NIX */
-
+ o->treatment= 1;
  o->target_ropts= NULL;
  o->new_wopts= NULL;
  for(i=0;i<65536;i++)
diff --git a/libisoburn/trunk/libisoburn/isoburn.h b/libisoburn/trunk/libisoburn/isoburn.h
index 232a7a3a..10b6b4e9 100644
--- a/libisoburn/trunk/libisoburn/isoburn.h
+++ b/libisoburn/trunk/libisoburn/isoburn.h
@@ -25,7 +25,6 @@ struct isoburn {
  /* -1= inappropriate media state detected */
  /* 0= libburn multi-session media, resp. undecided yet */
  /* 1= random access media */
- /* 2= standard i/o file */
  int emulation_mode;
 
  /* Although rarely used, libburn can operate on several */
@@ -44,18 +43,12 @@ struct isoburn {
  /* Aligned start address to be used for processing (counted in blocks) */
  int nwa;
 
-#ifdef NIX
-
- /* Path for eventual stdandard i/o (see .emulation_mode) */
- char *stdio_path;
-
- /* File descriptor for stdandard i/o. Points to stdio_path object if not -1 */
- int stdio_fd;
-
-#endif /* NIX */
 
  /* --- Vreixo's part --- */
 
+ /* Expansion treatment strategy: 1= grow, 2= modify, (any use for 0 ?) */
+ int treatment;
+
  /* The options for reading the old image. */
  /* target_ropts.size will contain the number of blocks of the image. */
  struct ecma119_read_opts *target_ropts;
@@ -101,6 +94,7 @@ int isoburn_start_emulation(struct isoburn *o, int flag);
 int isoburn_new_rwopts(struct isoburn *o);
 int isoburn_free_rwopts(struct isoburn *o);
 int isoburn_invalidate_iso(struct isoburn *o, int flag);
+int isoburn_read_volset(struct isoburn *o);
 
 #endif /* Isoburn_includeD */
 
diff --git a/libisoburn/trunk/libisoburn/libisoburn.h b/libisoburn/trunk/libisoburn/libisoburn.h
index 4967ede0..cab47381 100644
--- a/libisoburn/trunk/libisoburn/libisoburn.h
+++ b/libisoburn/trunk/libisoburn/libisoburn.h
@@ -104,7 +104,7 @@ int isoburn_disc_track_lba_nwa(struct burn_drive *d, struct burn_write_opts *o,
     BURN_DRIVE_IDLE is returned.
     Wrapper for: burn_disc_write()
 */
-int isoburn_disc_write(struct burn_write_opts *o, struct burn_disc *disc);
+void isoburn_disc_write(struct burn_write_opts *o, struct burn_disc *disc);
 
 
 /** Call this after isoburn_disc_write has finished and burn_drive_wrote_well()
@@ -112,7 +112,7 @@ int isoburn_disc_write(struct burn_write_opts *o, struct burn_disc *disc);
     multi-session functionality, if needed at all. Let libisoburn decide.
     Not a wrapper, but peculiar to libburn.
 */
-int isoburn_update_iso_descriptors(struct burn_drive *drive);
+int isoburn_activate_session(struct burn_drive *drive);
 
 
 /** Release an aquired drive.