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Cut a few Mb off the end of a file

Posted on 2002-04-16
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Last Modified: 2013-12-28
Hi,

I downloaded a file that has somehow managed to corrupt near the end. I can't roll back more than 5kb due to the download client being used (P2P network situation). I need to be able to clip off the last few Mb of a 600Mb file so that I can resume and continue with the file download.

Any suggestions on how this can be done quickly, easily and without expense?

200 points up for grabs.

My thanks in advance.
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Question by:peterchamberlin
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12 Comments
 
LVL 5

Expert Comment

by:pelejab
ID: 6946268
peterchamberlin, as far as I know some of these download accelerators split the download file into a number of parts (set in the options settings - usually 5) and download all 5 simultaneously for faster download. Therefore deleting the last xx megs may not be the solution to your problem as 5 sections of the file could all be corrupt. I may be wrong in this assumption. I have seen many file splitters/joiners for use in splitting files to fit on specified size disks. Your best bet would be to to a search in www.download.com or www.cnet.download.com (same web site) and look under utilities.
cheers, Pete
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LVL 5

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by:pelejab
ID: 6946278
oops, P2P.....my mistake in misreading. The file is most likely sequentially downloaded and therefore correct up to near the end. Unless its like a video or mp3 file you may have trouble trying to run it.
Pete
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LVL 6

Expert Comment

by:joe_massimino
ID: 6946426
You will have to download the complete file. Mostly I think that any attempt to edit the file will not give the results you would like.
You could get a hex editor (freeware, or shareware) and open the file and delete as many hex numbers as you like to simulate a file that is smaller than it should be. Then try to download it again and see if and can pickup from where you chopped it, but I doubt this will work.

Good luck..  

Where is the file and how big is it, I could have dumped it to a CD and mailed it to you by now.
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LVL 6

Expert Comment

by:joe_massimino
ID: 6946431
I have a T1 in my office. I will download and mail the program to you. Tell me where it is, and what it is called.  
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LVL 18

Expert Comment

by:centerv
ID: 6946648
Don't think you can do it.
I've never been succesful at it.
IE should resume the download, file most likely in ContentIE5\folder,
but very unlikely that it will.
Go here
click on Download Express for freebie and after install re-download file.
Good luck
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LVL 18

Expert Comment

by:centerv
ID: 6946651
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LVL 6

Expert Comment

by:bartsmit
ID: 6947856
Is this a video file? Your best bet in that case is virtualdub http://www.virtualdub.org/
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Author Comment

by:peterchamberlin
ID: 6948576
Thanks for your posts and offers to download the file for me. Luckily I hit the jackpot last night and found an app that did the raw file cutting that I required, details are as below...

http://www.geocities.com/Tokyo/Dojo/6810/alab/dlfc14.html

It seems to work by cutting up the file bit by bit using ASM or some other fast language. One possibility I had in mind was altering the FAT32 table's file size for that particular file. Anyway, it should now hopefully resume okay.

Also EE just lost my first reply to the thread that I typed, very frustrating, so this one is a tad shorter :)
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LVL 6

Expert Comment

by:joe_massimino
ID: 6948658
I don't think that the file cutter will work for you, but it does require registration to cut anything bigger than 1MB, so you will have to pay before you can see if it works.

The main purpose of filecutter is to take a lare file and break it down to smaller parts and then put them back together. In any case, you might want to find a <1Mb file to test on before you register it.

              Joe
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Author Comment

by:peterchamberlin
ID: 6948937
I did test it, did register it, and it did indeed do the job. It's also a very hand app too.
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by:Computer101
ID: 7134509
Hello all,
I am Computer101, a moderator from Experts-Exchange and also an expert within this topic area. This uestion has been open a long time.  What I am going to do is allow feedback from the questioner and xperts.  If it is not resolved, I will delete or accept an answer based on the info I have been given, Experts, feel free to offer input.  I will monitor these questions for a period of 5-7 days and come back and evaluate.  I will have another moderator (who is also an expert in this topic area) look at the question also to ensure we do the right thing for this question.

Thank you
Computer101
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