Hi there,
Im having this problem that wouldn't allow me to decompress rar files (only tried with rar files). It apparently only happens when dealing with really big files that are divided in parts, example: whatever.part01, whatever.part02... etc.
Now, imagine you have a file of lets say, 6 GB, which cointains an iso, divided in 13 parts of 500 MB each file (file 13 being 305 MB). So we have hello.part01, hello.part02, hello.part03... until hello.part13.
The first thing I noticed is that when you I was decompressing with Winrar, it would sometimes say theres a CRC error at, for example, part 4, 7, 8, and 10. Then, I try again, and it would say there is a CRC error at parts 2, 8, 9, 12, 13, for example. As you can see, thats totally random, since part 4 and 7 are not getting a CRC error on the second try. I tought, ok, this must be those known "fake crc errors". So I tried with 7zip. It decompressed me the whole thing, but at the end, it says File is broken, CRC bla bla. You can anyway see the iso, but if you try to install the program, you get a "blabla the file is corrupted and cannot be used bla" error.
What I did next is get a MD5 checksum of someone with the 13 files totally working, which is the next one:
4478280b13d78aeb0272e46510bb46c0 crs.part01.rar
016443f105e86bc605bc2cd177d9f976 crs.part02.rar
709be1f4204dba860e9fa636d34ec04f crs.part03.rar
aca6c96b72f1972c72510121e89ce324 crs.part04.rar
4ada0816285b42c2d204b588da15e14a crs.part05.rar
7a3bd82a55c397c4be07dd6308b3352d crs.part06.rar
cb056c655add5ad732abf571a1c6b2cd crs.part07.rar
a6073b10f8a0c9ac9c1c8575e64055d2 crs.part08.rar
7badf66b91c0dca6b997fd1cbe268963 crs.part09.rar
7901fdf40282df0611f3ff87816d7ec7 crs.part10.rar
fac242937e39ab3e846877448942cbaa crs.part11.rar
70bbafdc92592e568c1ee8a29e3f6a1d crs.part12.rar
2885449543aa3a84e96f3b67e7372c95 crs.part13.rar
Ok, then I did a checksum of my files. The result was:
4478280b13d78aeb0272e46510bb46c0 crs.part01.rar
016443f105e86bc605bc2cd177d9f976 crs.part02.rar
709be1f4204dba860e9fa636d34ec04f crs.part03.rar
aca6c96b72f1972c72510121e89ce324 crs.part04.rar
4ada0816285b42c2d204b588da15e14a crs.part05.rar
7a3bd82a55c397c4be07dd6308b3352d crs.part06.rar
cb056c655add5ad732abf571a1c6b2cd crs.part07.rar
a6073b10f8a0c9ac9c1c8575e64055d2 crs.part08.rar
7badf66b91c0dca6b997fd1cbe268963 crs.part09.rar
7901fdf40282df0611f3ff87816d7ec7 crs.part10.rar
fac242937e39ab3e846877448942cbaa crs.part11.rar
70bbafdc92592e568c1ee8a29e3f6a1d crs.part12.rar
2885449543aa3a84e96f3b67e7372c95 crs.part13.rar
The same!
After that, I can't think of anything else to try out. Just by curiosity, I decided to make another MD5 checksum of my files again. The result was:
4478280b13d78aeb0272e46510bb46c0 crs.part01.rar
016443f105e86bc605bc2cd177d9f976 crs.part02.rar
709be1f4204dba860e9fa636d34ec04f crs.part03.rar
aca6c96b72f1972c72510121e89ce324 crs.part04.rar
4ada0816285b42c2d204b588da15e14a crs.part05.rar
152515b7a070617d1c62ff0c18b853fa crs.part06.rar x 7a3bd82a55c397c4be07dd6308b3352d
cb056c655add5ad732abf571a1c6b2cd crs.part07.rar
a6073b10f8a0c9ac9c1c8575e64055d2 crs.part08.rar
7badf66b91c0dca6b997fd1cbe268963 crs.part09.rar
7901fdf40282df0611f3ff87816d7ec7 crs.part10.rar
fac242937e39ab3e846877448942cbaa crs.part11.rar
70bbafdc92592e568c1ee8a29e3f6a1d crs.part12.rar
2885449543aa3a84e96f3b67e7372c95 crs.part13.rar
What the hell? Part 6 is now corrupted? Lets try again:
4478280b13d78aeb0272e46510bb46c0 crs.part01.rar
3643f0567994dc2b810657cf8c691cfb crs.part02.rar x 016443f105e86bc605bc2cd177d9f976
709be1f4204dba860e9fa636d34ec04f crs.part03.rar
e4822a7868a04ba299da7f4f41dec0ec crs.part04.rar x aca6c96b72f1972c72510121e89ce324
4ada0816285b42c2d204b588da15e14a crs.part05.rar
7a3bd82a55c397c4be07dd6308b3352d crs.part06.rar
cb056c655add5ad732abf571a1c6b2cd crs.part07.rar
a6073b10f8a0c9ac9c1c8575e64055d2 crs.part08.rar
7badf66b91c0dca6b997fd1cbe268963 crs.part09.rar
7901fdf40282df0611f3ff87816d7ec7 crs.part10.rar
fac242937e39ab3e846877448942cbaa crs.part11.rar
70bbafdc92592e568c1ee8a29e3f6a1d crs.part12.rar
2885449543aa3a84e96f3b67e7372c95 crs.part13.rar
2 and 4 are now different? Are you kidding me? Again:
a1f55f104eabea6519e9e651f1bfad10 crs.part01.rar x 4478280b13d78aeb0272e46510bb46c0
3e6d40a6883f41502f3f8b2a9f8873b7 crs.part02.rar x 016443f105e86bc605bc2cd177d9f976
709be1f4204dba860e9fa636d34ec04f crs.part03.rar
aca6c96b72f1972c72510121e89ce324 crs.part04.rar
4ada0816285b42c2d204b588da15e14a crs.part05.rar
7a3bd82a55c397c4be07dd6308b3352d crs.part06.rar
cb056c655add5ad732abf571a1c6b2cd crs.part07.rar
c2c9fb2a52688b415b2dcca79f846732 crs.part08.rar x a6073b10f8a0c9ac9c1c8575e64055d2
7badf66b91c0dca6b997fd1cbe268963 crs.part09.rar
7901fdf40282df0611f3ff87816d7ec7 crs.part10.rar
fac242937e39ab3e846877448942cbaa crs.part11.rar
70bbafdc92592e568c1ee8a29e3f6a1d crs.part12.rar x 70bbafdc92592e568c1ee8a29e3f6a1d
d1b0987b785c62ad6b43ab31eebf2ba1 crs.part13.rar x 2885449543aa3a84e96f3b67e7372c95
1,2,8,12,13, a total mess!
I tried again:
4478280b13d78aeb0272e46510bb46c0 crs.part01.rar
016443f105e86bc605bc2cd177d9f976 crs.part02.rar
709be1f4204dba860e9fa636d34ec04f crs.part03.rar
aca6c96b72f1972c72510121e89ce324 crs.part04.rar
4ada0816285b42c2d204b588da15e14a crs.part05.rar
7a3bd82a55c397c4be07dd6308b3352d crs.part06.rar
cb056c655add5ad732abf571a1c6b2cd crs.part07.rar
a6073b10f8a0c9ac9c1c8575e64055d2 crs.part08.rar
7badf66b91c0dca6b997fd1cbe268963 crs.part09.rar
7901fdf40282df0611f3ff87816d7ec7 crs.part10.rar
fac242937e39ab3e846877448942cbaa crs.part11.rar
70bbafdc92592e568c1ee8a29e3f6a1d crs.part12.rar
2885449543aa3a84e96f3b67e7372c95 crs.part13.rar
WTF, all back to normal?
As you can see, this is highly unstable and theres no way to be 100% sure to know whats going on and what files are really corrupt, and I can't think of anything more precise than comparing MD5 strings. MD5 checksums changing that way is really weird by itself, so I want to know what can be causing such behaviour.
My rig is:
OS: WinXP SP2 with everything updated.
CPU:
Q6600 Revision G0
GPU:
XFX 8800GT XT
MB:
Gigabyte GA-X38-DQ6 Socket 775 DDR2
CPUFAN:
Asus Silent Square PRO
HD1: Samsung Spinpoint-T HD501LJ 500GB
HD2: Seagate Barracuda 250GB
RAM:
GeiL BackDragon DDR 800Mhz 1GBx2
-Programs used where MD5 Checksum Verifier and EF Checksum Manager v4.40, both did the same thing, so its not a software issue.
-I ran memtest (only 1 pass) and it wouldn't detect any error. I don't really know how to configure memtest for an optimal test anyway.
-HD1 is new and HD2 is saved from old computer, I tried to decompress and make MD5 checksums on both ones and the same happened.
-I closed Kapersky just in case is interfering when decompressing/making the MD5 checksum file.
-I remember this used to happen sometime with my old computer also.
Whats going on?
Im having this problem that wouldn't allow me to decompress rar files (only tried with rar files). It apparently only happens when dealing with really big files that are divided in parts, example: whatever.part01, whatever.part02... etc.
Now, imagine you have a file of lets say, 6 GB, which cointains an iso, divided in 13 parts of 500 MB each file (file 13 being 305 MB). So we have hello.part01, hello.part02, hello.part03... until hello.part13.
The first thing I noticed is that when you I was decompressing with Winrar, it would sometimes say theres a CRC error at, for example, part 4, 7, 8, and 10. Then, I try again, and it would say there is a CRC error at parts 2, 8, 9, 12, 13, for example. As you can see, thats totally random, since part 4 and 7 are not getting a CRC error on the second try. I tought, ok, this must be those known "fake crc errors". So I tried with 7zip. It decompressed me the whole thing, but at the end, it says File is broken, CRC bla bla. You can anyway see the iso, but if you try to install the program, you get a "blabla the file is corrupted and cannot be used bla" error.
What I did next is get a MD5 checksum of someone with the 13 files totally working, which is the next one:
4478280b13d78aeb0272e46510bb46c0 crs.part01.rar
016443f105e86bc605bc2cd177d9f976 crs.part02.rar
709be1f4204dba860e9fa636d34ec04f crs.part03.rar
aca6c96b72f1972c72510121e89ce324 crs.part04.rar
4ada0816285b42c2d204b588da15e14a crs.part05.rar
7a3bd82a55c397c4be07dd6308b3352d crs.part06.rar
cb056c655add5ad732abf571a1c6b2cd crs.part07.rar
a6073b10f8a0c9ac9c1c8575e64055d2 crs.part08.rar
7badf66b91c0dca6b997fd1cbe268963 crs.part09.rar
7901fdf40282df0611f3ff87816d7ec7 crs.part10.rar
fac242937e39ab3e846877448942cbaa crs.part11.rar
70bbafdc92592e568c1ee8a29e3f6a1d crs.part12.rar
2885449543aa3a84e96f3b67e7372c95 crs.part13.rar
Ok, then I did a checksum of my files. The result was:
4478280b13d78aeb0272e46510bb46c0 crs.part01.rar
016443f105e86bc605bc2cd177d9f976 crs.part02.rar
709be1f4204dba860e9fa636d34ec04f crs.part03.rar
aca6c96b72f1972c72510121e89ce324 crs.part04.rar
4ada0816285b42c2d204b588da15e14a crs.part05.rar
7a3bd82a55c397c4be07dd6308b3352d crs.part06.rar
cb056c655add5ad732abf571a1c6b2cd crs.part07.rar
a6073b10f8a0c9ac9c1c8575e64055d2 crs.part08.rar
7badf66b91c0dca6b997fd1cbe268963 crs.part09.rar
7901fdf40282df0611f3ff87816d7ec7 crs.part10.rar
fac242937e39ab3e846877448942cbaa crs.part11.rar
70bbafdc92592e568c1ee8a29e3f6a1d crs.part12.rar
2885449543aa3a84e96f3b67e7372c95 crs.part13.rar
The same!
After that, I can't think of anything else to try out. Just by curiosity, I decided to make another MD5 checksum of my files again. The result was:
4478280b13d78aeb0272e46510bb46c0 crs.part01.rar
016443f105e86bc605bc2cd177d9f976 crs.part02.rar
709be1f4204dba860e9fa636d34ec04f crs.part03.rar
aca6c96b72f1972c72510121e89ce324 crs.part04.rar
4ada0816285b42c2d204b588da15e14a crs.part05.rar
152515b7a070617d1c62ff0c18b853fa crs.part06.rar x 7a3bd82a55c397c4be07dd6308b3352d
cb056c655add5ad732abf571a1c6b2cd crs.part07.rar
a6073b10f8a0c9ac9c1c8575e64055d2 crs.part08.rar
7badf66b91c0dca6b997fd1cbe268963 crs.part09.rar
7901fdf40282df0611f3ff87816d7ec7 crs.part10.rar
fac242937e39ab3e846877448942cbaa crs.part11.rar
70bbafdc92592e568c1ee8a29e3f6a1d crs.part12.rar
2885449543aa3a84e96f3b67e7372c95 crs.part13.rar
What the hell? Part 6 is now corrupted? Lets try again:
4478280b13d78aeb0272e46510bb46c0 crs.part01.rar
3643f0567994dc2b810657cf8c691cfb crs.part02.rar x 016443f105e86bc605bc2cd177d9f976
709be1f4204dba860e9fa636d34ec04f crs.part03.rar
e4822a7868a04ba299da7f4f41dec0ec crs.part04.rar x aca6c96b72f1972c72510121e89ce324
4ada0816285b42c2d204b588da15e14a crs.part05.rar
7a3bd82a55c397c4be07dd6308b3352d crs.part06.rar
cb056c655add5ad732abf571a1c6b2cd crs.part07.rar
a6073b10f8a0c9ac9c1c8575e64055d2 crs.part08.rar
7badf66b91c0dca6b997fd1cbe268963 crs.part09.rar
7901fdf40282df0611f3ff87816d7ec7 crs.part10.rar
fac242937e39ab3e846877448942cbaa crs.part11.rar
70bbafdc92592e568c1ee8a29e3f6a1d crs.part12.rar
2885449543aa3a84e96f3b67e7372c95 crs.part13.rar
2 and 4 are now different? Are you kidding me? Again:
a1f55f104eabea6519e9e651f1bfad10 crs.part01.rar x 4478280b13d78aeb0272e46510bb46c0
3e6d40a6883f41502f3f8b2a9f8873b7 crs.part02.rar x 016443f105e86bc605bc2cd177d9f976
709be1f4204dba860e9fa636d34ec04f crs.part03.rar
aca6c96b72f1972c72510121e89ce324 crs.part04.rar
4ada0816285b42c2d204b588da15e14a crs.part05.rar
7a3bd82a55c397c4be07dd6308b3352d crs.part06.rar
cb056c655add5ad732abf571a1c6b2cd crs.part07.rar
c2c9fb2a52688b415b2dcca79f846732 crs.part08.rar x a6073b10f8a0c9ac9c1c8575e64055d2
7badf66b91c0dca6b997fd1cbe268963 crs.part09.rar
7901fdf40282df0611f3ff87816d7ec7 crs.part10.rar
fac242937e39ab3e846877448942cbaa crs.part11.rar
70bbafdc92592e568c1ee8a29e3f6a1d crs.part12.rar x 70bbafdc92592e568c1ee8a29e3f6a1d
d1b0987b785c62ad6b43ab31eebf2ba1 crs.part13.rar x 2885449543aa3a84e96f3b67e7372c95
1,2,8,12,13, a total mess!
I tried again:
4478280b13d78aeb0272e46510bb46c0 crs.part01.rar
016443f105e86bc605bc2cd177d9f976 crs.part02.rar
709be1f4204dba860e9fa636d34ec04f crs.part03.rar
aca6c96b72f1972c72510121e89ce324 crs.part04.rar
4ada0816285b42c2d204b588da15e14a crs.part05.rar
7a3bd82a55c397c4be07dd6308b3352d crs.part06.rar
cb056c655add5ad732abf571a1c6b2cd crs.part07.rar
a6073b10f8a0c9ac9c1c8575e64055d2 crs.part08.rar
7badf66b91c0dca6b997fd1cbe268963 crs.part09.rar
7901fdf40282df0611f3ff87816d7ec7 crs.part10.rar
fac242937e39ab3e846877448942cbaa crs.part11.rar
70bbafdc92592e568c1ee8a29e3f6a1d crs.part12.rar
2885449543aa3a84e96f3b67e7372c95 crs.part13.rar
WTF, all back to normal?
As you can see, this is highly unstable and theres no way to be 100% sure to know whats going on and what files are really corrupt, and I can't think of anything more precise than comparing MD5 strings. MD5 checksums changing that way is really weird by itself, so I want to know what can be causing such behaviour.
My rig is:
OS: WinXP SP2 with everything updated.
CPU:
Q6600 Revision G0
GPU:
XFX 8800GT XT
MB:
Gigabyte GA-X38-DQ6 Socket 775 DDR2
CPUFAN:
Asus Silent Square PRO
HD1: Samsung Spinpoint-T HD501LJ 500GB
HD2: Seagate Barracuda 250GB
RAM:
GeiL BackDragon DDR 800Mhz 1GBx2
-Programs used where MD5 Checksum Verifier and EF Checksum Manager v4.40, both did the same thing, so its not a software issue.
-I ran memtest (only 1 pass) and it wouldn't detect any error. I don't really know how to configure memtest for an optimal test anyway.
-HD1 is new and HD2 is saved from old computer, I tried to decompress and make MD5 checksums on both ones and the same happened.
-I closed Kapersky just in case is interfering when decompressing/making the MD5 checksum file.
-I remember this used to happen sometime with my old computer also.
Whats going on?