diff --git a/xorriso/drive_mgt.c b/xorriso/drive_mgt.c
index f70d9937..48726728 100644
--- a/xorriso/drive_mgt.c
+++ b/xorriso/drive_mgt.c
@@ -2543,8 +2543,7 @@ int Xorriso_chunk_md5(struct XorrisO *xorriso, char *data, int to_read,
        Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, sev_text, 0);
      }
      if(valid && (tag_type == 1 || (tag_type == 4 && pos == lba && lba < 32))){
-       if(state->md5_spot_value != Xorriso_read_quality_untesteD &&
-         Xorriso_read_quality_md5_mismatcH <= xorriso->check_media_bad_limit){
+       if(state->md5_spot_value != Xorriso_read_quality_untesteD) {
          ret= Xorriso__add_spot(state, state->md5_start,
              state->md5_spot_lba - state->md5_start, state->md5_spot_value, 0);
          if(ret <= 0)
diff --git a/xorriso/xorriso.1 b/xorriso/xorriso.1
index a52a8be8..21100d14 100644
--- a/xorriso/xorriso.1
+++ b/xorriso/xorriso.1
@@ -9,7 +9,7 @@
 .\" First parameter, NAME, should be all caps
 .\" Second parameter, SECTION, should be 1-8, maybe w/ subsection
 .\" other parameters are allowed: see man(7), man(1)
-.TH XORRISO 1 "Version 1.5.1, Oct 08, 2018"
+.TH XORRISO 1 "Version 1.5.1, Nov 01, 2018"
 .\" Please adjust this date whenever revising the manpage.
 .\"
 .\" Some roff macros, for reference:
@@ -4663,6 +4663,12 @@ supposed to be ok but stem from a suspicious neighborhood.
 The former is a strong confirmation for quality, the latter only tells that
 one or more blocks of the region must be wrong.
 .br
+By default bad_limit is set higher than md5_mismatch, so that mismatches are
+classified as quality class "0" rather than "\-". This means that the sectors
+of a MD5 mismatch range are recorded in the sector_map as successfully read,
+if the drive handed them out at all. Set "bad_limit=md5_mismatch" to let the
+sector_map record the whole mismatching range as yet not retrieved.
+.br
 \fBslow_limit=threshold\fR
 sets the time threshold for a single read chunk to be considered
 slow. This may be a fractional number like 0.1 or 1.5.
diff --git a/xorriso/xorriso.info b/xorriso/xorriso.info
index a8f1d284..c93008ef 100644
--- a/xorriso/xorriso.info
+++ b/xorriso/xorriso.info
@@ -3914,6 +3914,13 @@ transmission errors.
           other quality.  The former is a strong confirmation for
           quality, the latter only tells that one or more blocks of the
           region must be wrong.
+          By default bad_limit is set higher than md5_mismatch, so that
+          mismatches are classified as quality class "0" rather than
+          "-".  This means that the sectors of a MD5 mismatch range are
+          recorded in the sector_map as successfully read, if the drive
+          handed them out at all.  Set "bad_limit=md5_mismatch" to let
+          the sector_map record the whole mismatching range as yet not
+          retrieved.
      slow_limit=threshold
           sets the time threshold for a single read chunk to be
           considered slow.  This may be a fractional number like 0.1 or
@@ -5268,8 +5275,8 @@ File: xorriso.info,  Node: CommandIdx,  Next: ConceptIdx,  Prev: Legal,  Up: Top
 * -cdx sets working directory on disk:   Navigate.            (line  15)
 * -changes_pending overrides change status: Writing.          (line  12)
 * -charset sets input/output character set: Charset.          (line  54)
-* -check_md5 verifies file checksum:     Verify.              (line 166)
-* -check_md5_r verifies file tree checksums: Verify.          (line 180)
+* -check_md5 verifies file checksum:     Verify.              (line 173)
+* -check_md5_r verifies file tree checksums: Verify.          (line 187)
 * -check_media reads media block by block: Verify.            (line  21)
 * -check_media_defaults sets -check_media options: Verify.    (line  40)
 * -chgrp sets group in ISO image:        Manip.               (line  49)
@@ -5765,8 +5772,8 @@ File: xorriso.info,  Node: ConceptIdx,  Prev: CommandIdx,  Up: Top
 * Verify, compare ISO and disk file, -compare: Navigate.      (line 131)
 * Verify, compare ISO and disk tree, -compare_r: Navigate.    (line 143)
 * Verify, compare ISO and disk, -compare_l: Navigate.         (line 147)
-* Verify, file checksum, -check_md5:     Verify.              (line 166)
-* Verify, file tree checksums, -check_md5_r: Verify.          (line 180)
+* Verify, file checksum, -check_md5:     Verify.              (line 173)
+* Verify, file tree checksums, -check_md5_r: Verify.          (line 187)
 * Verify, preset -check_media, -check_media_defaults: Verify. (line  40)
 * Write, block size, -dvd_obs:           SetWrite.            (line 330)
 * Write, bootability, -boot_image:       Bootable.            (line  75)
@@ -5827,33 +5834,33 @@ Node: DialogCtl183563
 Node: Inquiry186165
 Node: Navigate195049
 Node: Verify203506
-Node: Restore213529
-Node: Emulation222142
-Node: Scripting232601
-Node: Frontend240384
-Node: Examples250010
-Node: ExDevices251188
-Node: ExCreate251849
-Node: ExDialog253149
-Node: ExGrowing254420
-Node: ExModifying255229
-Node: ExBootable255739
-Node: ExCharset256294
-Node: ExPseudo257190
-Node: ExCdrecord258117
-Node: ExMkisofs258437
-Node: ExGrowisofs259794
-Node: ExException260948
-Node: ExTime261406
-Node: ExIncBackup261864
-Node: ExRestore265890
-Node: ExRecovery266836
-Node: Files267408
-Node: Environ268742
-Node: Seealso269451
-Node: Bugreport270168
-Node: Legal270759
-Node: CommandIdx271771
-Node: ConceptIdx289105
+Node: Restore213977
+Node: Emulation222590
+Node: Scripting233049
+Node: Frontend240832
+Node: Examples250458
+Node: ExDevices251636
+Node: ExCreate252297
+Node: ExDialog253597
+Node: ExGrowing254868
+Node: ExModifying255677
+Node: ExBootable256187
+Node: ExCharset256742
+Node: ExPseudo257638
+Node: ExCdrecord258565
+Node: ExMkisofs258885
+Node: ExGrowisofs260242
+Node: ExException261396
+Node: ExTime261854
+Node: ExIncBackup262312
+Node: ExRestore266338
+Node: ExRecovery267284
+Node: Files267856
+Node: Environ269190
+Node: Seealso269899
+Node: Bugreport270616
+Node: Legal271207
+Node: CommandIdx272219
+Node: ConceptIdx289553
 
 End Tag Table
diff --git a/xorriso/xorriso.texi b/xorriso/xorriso.texi
index 1065b6ad..71fb799d 100644
--- a/xorriso/xorriso.texi
+++ b/xorriso/xorriso.texi
@@ -50,7 +50,7 @@
 @c man .\" First parameter, NAME, should be all caps
 @c man .\" Second parameter, SECTION, should be 1-8, maybe w/ subsection
 @c man .\" other parameters are allowed: see man(7), man(1)
-@c man .TH XORRISO 1 "Version 1.5.1, Oct 08, 2018"
+@c man .TH XORRISO 1 "Version 1.5.1, Nov 01, 2018"
 @c man .\" Please adjust this date whenever revising the manpage.
 @c man .\"
 @c man .\" Some roff macros, for reference:
@@ -5380,6 +5380,12 @@ supposed to be ok but stem from a suspicious neighborhood.
 The former is a strong confirmation for quality, the latter only tells that
 one or more blocks of the region must be wrong.
 @*
+By default bad_limit is set higher than md5_mismatch, so that mismatches are
+classified as quality class "0" rather than "-". This means that the sectors
+of a MD5 mismatch range are recorded in the sector_map as successfully read,
+if the drive handed them out at all. Set "bad_limit=md5_mismatch" to let the
+sector_map record the whole mismatching range as yet not retrieved.
+@*
 @item slow_limit=threshold
 sets the time threshold for a single read chunk to be considered
 slow. This may be a fractional number like 0.1 or 1.5.
diff --git a/xorriso/xorriso_timestamp.h b/xorriso/xorriso_timestamp.h
index d3a0e618..edd3de4f 100644
--- a/xorriso/xorriso_timestamp.h
+++ b/xorriso/xorriso_timestamp.h
@@ -1 +1 @@
-#define Xorriso_timestamP "2018.10.12.104229"
+#define Xorriso_timestamP "2018.11.01.100352"