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Forum: UltraISO Topic: Roundtrip of MD5 sgnatures started by: mwb1100 Posted by mwb1100 on Sep. 20 2006,16:36
I downloaded an ISO of Vista RC1 from Microsoft and ran an MD5 utility to verify that the file was not corrupt. I then wrote the ISO to DVD using UltraISO, and when I got to work used UltraISO to create a new ISO image there. However, the MD5 of that file does not match the original. Should I expect that round-tripping an ISO->disc->ISO will produce the same MD5, or does something (a timestamp maybe) get written to disc that's not in the ISO image? Posted by xoben on Sep. 21 2006,04:31
As padding blocks may be added, please check 'Enable ISO Volume Filter' when making an ISO from disc.
Posted by mwb1100 on Sep. 21 2006,16:36
This did change the MD5, but still not the same as the original.I'm not too worried about this, unless you think that the MD5's should match. In case it matters, the original ISO was downloaded from Microsoft, then burned using Alcohol 120%. The 'duplicate' ISO is being created with UltraISO. Maybe I'll try burning with UltraISO as another test. Posted by xoben on Sep. 21 2006,19:56
Just tested it this way, no problem found for UltraBurn(< build-in burning engine of UltraISO >):OS: Windows XP SP2 Recorder: Plextor-PX750 Disc: Verbatim 16X DVD+R Original File: vista_5600.16384.060829-2230_x86fre_client-lr1cfre_en_dvd.iso Original MD5: 22486e815a38feffd9667317dfeec55a Burner: UltraBurn Burn speed: 16X Copy to ISO: LR1CFRE_EN_DVD.iso New ISO MD5: 22486e815a38feffd9667317dfeec55a Testing more: Burner: NeroAPI Burn speed: 8X Copy to ISO: LR1CFRE_EN_DVD.iso MD5: 'Enable ISO Volume Filter' ON: 22486e815a38feffd9667317dfeec55a 'Enable ISO Volume Filter' OFF: b8f02b6730341e26a6767f42fff8e9db Posted by mwb1100 on Sep. 22 2006,11:38
OK, using UltraBurn to burn the DVD and reading that DVD into an ISO with the 'Enable ISO Volume Filter' option turned on did the trick.The MD5 on the 'duplicate' ISO matches. Nice! Thanks. |