diff --git a/cdrskin/cdrskin_timestamp.h b/cdrskin/cdrskin_timestamp.h
index a7577f4..8df286f 100644
--- a/cdrskin/cdrskin_timestamp.h
+++ b/cdrskin/cdrskin_timestamp.h
@@ -1 +1 @@
-#define Cdrskin_timestamP "2011.03.10.132603"
+#define Cdrskin_timestamP "2011.03.12.093520"
diff --git a/libburn/mmc.c b/libburn/mmc.c
index 6804bf2..7fdb70a 100644
--- a/libburn/mmc.c
+++ b/libburn/mmc.c
@@ -347,9 +347,10 @@ int mmc_reserve_track(struct burn_drive *d, off_t size)
 	memcpy(c.opcode, MMC_RESERVE_TRACK, sizeof(MMC_RESERVE_TRACK));
 */
 	c.retry = 1;
-	/* Round to 32 KiB and divide by 2048
-	   (by nice binary rounding trick learned from dvd+rw-tools) */
-	lba = ((size + (off_t) 0x7fff) >> 11) & ~0xf;
+
+	lba = size / 2048;
+	if (size % 2048)
+		lba++;
 	mmc_int_to_four_char(c.opcode+5, lba);
 
 	sprintf(msg, "reserving track of %d blocks", lba);
diff --git a/libburn/write.c b/libburn/write.c
index 6862ea7..025f6fc 100644
--- a/libburn/write.c
+++ b/libburn/write.c
@@ -1119,11 +1119,13 @@ int burn_disc_open_track_dvd_minus_r(struct burn_write_opts *o,
 #endif
 
 	if (o->write_type == BURN_WRITE_SAO) { /* DAO */
- 		/* Round track size up to write chunk size and reserve track */
 		size = ((off_t) burn_track_get_sectors(s->track[tnum]))
 			* (off_t) 2048;
-		if (size % o->obs)
+
+ 		/* Eventually round track size up to write chunk */
+		if (o->obs_pad && (size % o->obs))
 			size += (off_t) (o->obs - (size % o->obs));
+
 		ret = d->reserve_track(d, size);
 		if (ret <= 0) {
 			sprintf(msg, "Cannot reserve track of %.f bytes",
@@ -1164,6 +1166,10 @@ int burn_disc_open_track_dvd_plus_r(struct burn_write_opts *o,
  		/* Round track size up to write chunk size and reserve track */
 		size = ((off_t) burn_track_get_sectors(s->track[tnum]))
 			* (off_t) 2048;
+		/* o->obs should be 32k or 64k already. But 32k alignment
+		  was once performed in d->reserve_track() */
+		if (o->obs % 32768)
+			o->obs += 32768 - (o->obs % 32768);
 		if (size % o->obs)
 			size += (off_t) (o->obs - (size % o->obs));
 		ret = d->reserve_track(d, size);
@@ -1892,6 +1898,8 @@ int burn_dvd_write_sync(struct burn_write_opts *o,
 				  msg, 0, 0);
 			burn_track_set_size(t, default_size);
 		}
+		/* Whether to fill-up last 32k buffer of track. */
+		o->obs_pad = (o->write_type != BURN_WRITE_SAO);
 		ret = burn_disc_setup_dvd_minus_r(o, disc);
 		if (ret <= 0) {
 			sprintf(msg,
@@ -1902,8 +1910,6 @@ int burn_dvd_write_sync(struct burn_write_opts *o,
 				msg, 0, 0);
 			goto early_failure;
 		}
-		/* ??? padding needed ??? cowardly doing it for now */
-		o->obs_pad = 1; /* fill-up track's last 32k buffer */
 		
 	} else if (d->current_profile == 0x1b || d->current_profile == 0x2b ||
 		   d->current_profile == 0x41) {