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Old 10-16-2003, 06:03 PM   #1
ciaranhearne
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Slackware 9.1 iso - md5 checksum failed serveral times


I have recently tried to download Slackware 9.1 from the official mirrors listed on the slackware site. However after downloading the 1st cd the md5checksum did not match, neither did the second CD.
I thought the file may have become corrupted somehow during download so I downloaded CD1 again and the same thing happened.
I also tried downloading it from another ftp server, and I still had the same problem.
I created md5checksums for the new and old CD1 ISO and they did not match each other so this lead me to believe that there was definitely something wrong with my connection.

I used filezilla 2.2.1 to download the ISO's. I am running windows xp professional sp1. I am on 56k and get disconnected after every 2 hours. I have an external hardware modem with modem error control turned on connected via the COM port.

I asked a friend with a broadband connection to download CD1 and the checksum still failed, this download was not interrupted. wget v1.8.2 (w32) was used to download it. This checksum was different to all three of mine.
My friends computer was running windows 98se

After this I decided to extract the ISO and then verify the checksums for the individual files inside, what I found was the same 420 files failed each time for all of the ISO's (even though they had different checksums).
 
Old 10-16-2003, 06:26 PM   #2
trickykid
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Try this FTP site: ftp://ftp.kpn.be/

Very reliable and I never have any problems downloading from them.
 
Old 10-16-2003, 06:29 PM   #3
superbondbond
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Maybe try downloading from BitTorrent. Probably should use a broadband connection, 56K would take forever... I downloaded both disc 1 & 2 simultaneously and it took only a couple of hours (cable modem)


see this link
 
Old 10-17-2003, 02:34 AM   #4
ciaranhearne
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I will try downloading from ftp.kpn.be. (This is more efficient than bit torrent for 56k as I can only download at about 4.7KB/s maximum anyway.)
I am still curious how the checksum failed, even though it was downloaded from two different computers with two different ISPs off two different servers. Do you think there could be a problem with my connection? (This would mean a problem with my friends as well) or do you think it is a problem with downloading software (I always thought wget was very reliable so this doesn’t seem likely) or is it a problem with the FTP server? (Surely someone else would have made a post about this somewhere).
 
Old 10-20-2003, 02:18 AM   #5
ciaranhearne
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I downloaded disk 1 from ftp.kpn.be and the same thing happened again; the checksum did not match, and when I extracted the ISO and checked the individual files the exact same files failed again.
 
Old 10-20-2003, 04:30 AM   #6
cleanek
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Yes i've got same propblem when i downloading 9.0-iso. On some mirrors are file with different md5 sums (md5 checksumfile is original, but size of image doesn't match,and your md5Checsum doesn't match too) Best way is get original imagesize from slackware ftp, and then tryto found iso file with same size.
I download it from ftp://ftp.planetmirror.com/ and checksums are ok. speed was good too.
 
Old 10-21-2003, 01:56 AM   #7
Shade
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For one thing, ISOs MUST be downloaded in Binary format, rather than ASCII.

Make sure they were downloaded in Binary protocol.

-Shade
 
Old 10-21-2003, 02:11 AM   #8
ciaranhearne
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They were definitely downloaded in binary format.
 
Old 10-21-2003, 04:40 AM   #9
abhay
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imo you should post the MD5SUM that you are getting and the one you are checking it against.
people can then match with what they have as their own. i have a feeling that you are checking it against some wrong MD5SUM. downloading 4 times...yikes!!!

Last edited by abhay; 10-21-2003 at 04:41 AM.
 
Old 10-21-2003, 02:18 PM   #10
ciaranhearne
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After I downloaded CD1 for the 4th time and it failed I just gave up and deleted the directory with the ISO and all my checksums in. I have just tried to recover the data; unfortunately I could only recover one of the checksums.

d01dbecb1053000615a476cbd40dba1b

Do you think that because I use a dialup and get disconnected after every 2 hours this could lead to corruption of the ISO whilst downloading?
 
Old 10-21-2003, 03:53 PM   #11
abhay
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i m on a 32KB connection (yeah laugh) and i resumed like 27 times while downloading first slackware CD. till now i have downloaded 3 CD's of Mandrake 9.1, 3 CD's of Redhat 9.0, 2 CD's of Slackware 9.1, 1 CD of Slackware 9.0 and at least 2 CD's worth of updates and other softwares but never got a MD5SUM error (touchwood) so imo it is not cos of a bad connection.
 
Old 11-07-2003, 04:03 PM   #12
froedi
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I have downloaded discs #1 & #2 several times now (FTPs as well as bittorrent) and none of the md5 checksums matched so far.

what's the worst thing that could happen if I burned these CDs and used them?
 
Old 11-08-2003, 10:07 AM   #13
ksd
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i've downloaded the first cd of slackware 9.1 and found out to my dismay that the md5sum is not the same as one postedon hte site....i went on and burnt the cd and the final result is.....a wasted CD..my connection is 32kbps and it takes almost and eternity to download one iso image..and at the end of every thing..result is failure...i think there is no good download manager..i have tried kget.wget..prozilla...curl..the problem with everyone of these is when ever i resume download after it has stalled some how..it starts downloading from the beginning...i have user -c and -r for resuming in wget and prozilla respectively...but of no avail...what to do..i am not able to download the big files...is in't there an effective download manager whic h can accurately resume the download after a download is stalled?
 
Old 11-23-2003, 01:25 AM   #14
jariep
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corrupt download failed md5sum please help

I downloaded redhat 9, the three discs, and burned the iso's to CD. I used a 56k modem that connected at 28.8bps, an SM56 modem (motorola chip).

The installer worked all the way to the beginning of the installation of the software onto the hard disk, then it said there was an error reading the first package on the cd to be installed.

Rawrite for windows also worked to make the boot floppy which i used.

I had problems with my cdrom drive so i used the CDRW drive, which is also in the system (I needed the boot floppy because it was the secondary slave drive, it wouldn't bootup directly from the slave drive on startup... so using the boot floppy it recognized the secondary slave drive on bootup and went onto starting the redhat 9 install program.

the MD5SUMs failed also.

Sun Microsystems has a fail safe way to download using their free sun download manager which has a special error correction feature using Sun's download site. Even though the Sun download manager works with any ftp or http site the special error correction features only work with sun's download site.

It would be nice if some error correction feature like Forward Error Correction or some special method could be used to download files without such a high chance of file corruption during transfer. i read that FTP is already 30 or so years old.

If anybody has any ideas on how I could download with better chances of success please tell me. I have one idea, which is to download the OS without using ISOs to download and instead download the files individually and then build the cd manually... or maybe this is a bad idea.

Any help / suggestions would be greatly appreciated.

I made an error about FEC, Forward Error Correction, it doesn't work with analog systems like 56k modems and slower.

Last edited by jariep; 11-24-2003 at 04:48 PM.
 
Old 11-23-2003, 01:19 PM   #15
shepper
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I had troubles with corrupt *.iso and large file transfers in linux to my usb-flash drive until I disabled s.m.a.r.t. in my bios. I do not know what this does in Windoz though. Just a thought but worth trying if you are downloading to a linux machine.
 
  


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