Here's what the ROM Collection Rebuilder produces (self-contained), which looks good to me:

Code:
rene@marvin:~> unzip -vl /home/games/mame/export/roadblstgu.zip
Archive:  /home/games/mame/export/roadblstgu.zip
 Length   Method    Size  Cmpr    Date    Time   CRC-32   Name
--------  ------  ------- ---- ---------- ----- --------  ----
     256  Defl:N       17  93% 2016-04-30 15:50 7e84972a  136032.101.e3
     256  Defl:N       20  92% 2016-04-30 15:50 ebf1e0ae  136032.102.e5
     235  Defl:N      125  47% 2016-04-30 15:50 92d6a0b4  136032.103.f7.bin
     256  Defl:N       17  93% 2016-04-30 15:50 7e84972a  136032.101.e3
     256  Defl:N       20  92% 2016-04-30 15:50 ebf1e0ae  136032.102.e5
     235  Defl:N      125  47% 2016-04-30 15:50 92d6a0b4  136032.103.f7.bin
   16384  Defl:N     7091  57% 2016-04-30 15:50 195c54ad  136032-114.j7
   16384  Defl:N     8626  47% 2016-04-30 15:50 7275b4dc  136032-115.j8
   32768  Defl:N    14750  55% 2016-04-30 15:50 604a5cc0  136048-1257.c11
   32768  Defl:N    19257  41% 2016-04-30 15:50 3d10929d  136048-1258.a11
   32768  Defl:N     8554  74% 2016-04-30 15:50 b9c807ac  136048-1259.c13
   32768  Defl:N    16313  50% 2016-04-30 15:50 eaeb1196  136048-1260.a13
   32768  Defl:N     2201  93% 2016-04-30 15:50 054273b2  136048-1163.c12
   32768  Defl:N    10352  68% 2016-04-30 15:50 49181bec  136048-1164.a12
   32768  Defl:N     1594  95% 2016-04-30 15:50 f63dc29a  136048-1165.c14
   32768  Defl:N     7869  76% 2016-04-30 15:50 b1fc5955  136048-1166.a14
   32768  Defl:N     7909  76% 2016-04-30 15:50 c6d30d6f  136048-1167.c16
   32768  Defl:N    16041  51% 2016-04-30 15:50 16951020  136048-1168.a16
   16384  Defl:N      605  96% 2016-04-30 15:50 5c1adf67  136048-2147.c17
   16384  Defl:N     6423  61% 2016-04-30 15:50 d9ac8966  136048-2148.a17
   16384  Defl:N     9345  43% 2016-04-30 15:50 2e54f95e  136048-1149.e14
   16384  Defl:N     9282  43% 2016-04-30 15:50 ee318052  136048-1169.e15
   16384  Defl:N     9049  45% 2016-04-30 15:50 75dfec33  136048-1170.e17
    8192  Defl:N     4069  50% 2016-04-30 15:50 7a29dc07  136032.107.b2
   32768  Defl:N    13432  59% 2016-04-30 15:50 fe342d27  136048-1101.b4
   32768  Defl:N    11586  65% 2016-04-30 15:50 17c7e780  136048-1102.b9
   32768  Defl:N     9898  70% 2016-04-30 15:50 39688e01  136048-1103.f4
   32768  Defl:N     7746  76% 2016-04-30 15:50 c8f9bd8e  136048-1104.f9
   32768  Defl:N     1214  96% 2016-04-30 15:50 c69e439e  136048-1105.h4
   32768  Defl:N      754  98% 2016-04-30 15:50 4ee55796  136048-1106.h9
   32768  Defl:N    18187  45% 2016-04-30 15:50 2533be39  136048-1119.b3
   32768  Defl:N    13040  60% 2016-04-30 15:50 3de4f4db  136048-1120.b8
   32768  Defl:N    13356  59% 2016-04-30 15:50 4a1b6b9f  136048-1121.f3
   32768  Defl:N    11691  64% 2016-04-30 15:50 680bdb7d  136048-1122.f8
   32768  Defl:N    17986  45% 2016-04-30 15:50 a405d8bf  136048-1123.b2
   32768  Defl:N    16401  50% 2016-04-30 15:50 b9070c2e  136048-1124.b7
   32768  Defl:N    13988  57% 2016-04-30 15:50 5dfac572  136048-1125.f2
   32768  Defl:N    14338  56% 2016-04-30 15:50 a0416c6d  136048-1126.f7
   32768  Defl:N    17549  46% 2016-04-30 15:50 0138b391  136048-1127.b1
   32768  Defl:N    15941  51% 2016-04-30 15:50 5136fb4b  136048-1128.b6
   32768  Defl:N    14805  55% 2016-04-30 15:50 7d75bb12  136048-1129.f1
   32768  Defl:N    11380  65% 2016-04-30 15:50 81bb54d9  136048-1130.f6
   32768  Defl:N    13958  57% 2016-04-30 15:50 72233889  136048-1131.d4
   32768  Defl:N    13159  60% 2016-04-30 15:50 6a82b8a7  136048-1132.d9
   32768  Defl:N    11740  64% 2016-04-30 15:50 845dd347  136048-1133.d2
   32768  Defl:N     9270  72% 2016-04-30 15:50 54e4c9e6  136048-1134.d7
   65536  Defl:N    30338  54% 2016-04-30 15:50 a47bc79d  136048-1115.d3
   65536  Defl:N    28050  57% 2016-04-30 15:50 b8a5c215  136048-1116.d8
   65536  Defl:N    22303  66% 2016-04-30 15:50 2d1c1f64  136048-1117.d1
   65536  Defl:N    24661  62% 2016-04-30 15:50 be879b8e  136048-1118.d6
     512  Defl:N      120  77% 2016-04-30 15:50 db4a4d53  136048-1174.a7
     512  Defl:N       58  89% 2016-04-30 15:50 c80574af  136048-1173.a5
--------          -------  ---                            -------
 1436118           536603  63%                            52 files

A "space-efficient" set would only contain these:

Code:
rene@marvin:~> unzip -vl /home/games/mame/export/roadblstgu.zip
Archive:  /home/games/mame/export/roadblstgu.zip
 Length   Method    Size  Cmpr    Date    Time   CRC-32   Name
--------  ------  ------- ---- ---------- ----- --------  ----
   32768  Defl:N    14750  55% 2016-04-30 15:53 604a5cc0  136048-1257.c11
   32768  Defl:N    19257  41% 2016-04-30 15:53 3d10929d  136048-1258.a11
   32768  Defl:N     8554  74% 2016-04-30 15:53 b9c807ac  136048-1259.c13
   32768  Defl:N    16313  50% 2016-04-30 15:53 eaeb1196  136048-1260.a13
   32768  Defl:N    18187  45% 2016-04-30 15:53 2533be39  136048-1119.b3
   32768  Defl:N    13040  60% 2016-04-30 15:53 3de4f4db  136048-1120.b8
   32768  Defl:N    13356  59% 2016-04-30 15:53 4a1b6b9f  136048-1121.f3
   32768  Defl:N    11691  64% 2016-04-30 15:53 680bdb7d  136048-1122.f8
   32768  Defl:N    17986  45% 2016-04-30 15:53 a405d8bf  136048-1123.b2
   32768  Defl:N    16401  50% 2016-04-30 15:53 b9070c2e  136048-1124.b7
   32768  Defl:N    13988  57% 2016-04-30 15:53 5dfac572  136048-1125.f2
   32768  Defl:N    14338  56% 2016-04-30 15:53 a0416c6d  136048-1126.f7
   32768  Defl:N    17549  46% 2016-04-30 15:53 0138b391  136048-1127.b1
   32768  Defl:N    15941  51% 2016-04-30 15:53 5136fb4b  136048-1128.b6
   32768  Defl:N    14805  55% 2016-04-30 15:53 7d75bb12  136048-1129.f1
   32768  Defl:N    11380  65% 2016-04-30 15:53 81bb54d9  136048-1130.f6
   32768  Defl:N    13958  57% 2016-04-30 15:53 72233889  136048-1131.d4
   32768  Defl:N    13159  60% 2016-04-30 15:53 6a82b8a7  136048-1132.d9
   32768  Defl:N    11740  64% 2016-04-30 15:53 845dd347  136048-1133.d2
   32768  Defl:N     9270  72% 2016-04-30 15:53 54e4c9e6  136048-1134.d7
--------          -------  ---                            -------
  655360           285663  56%                            20 files

Last edited by qmc2; 04/30/16 01:55 PM.

A mind is like a parachute. It doesn't work unless it's open. [Frank Zappa]