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Old 05-05-2010, 06:18 PM   #1
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Transferring an iso to different computer via usb device

I have two somewhat older computers, an HP laptop running Ubuntu Gutsy Gibbon and a custom desktop running Debian Lenny. They are not networked, and I do not have home internet access since I recently moved to an area where broadband is not available and I have a winmodem. I am trying to upgrade the system on the laptop, but have run into a strange problem. I have downloaded a copy of the Xubuntu Karmic Koala iso from a public wifi spot onto the laptop. The laptop does not have a CD burner, so I am attempting to transfer the image to the desktop computer via a usb device. The problem is that it will not transfer accurately. The md5sum of the iso is fine on the laptop hard drive and also after I have copied it to the usb device. I unmount the usb device from the laptop, connect it to the desktop, and copy the file to the desktop hard drive, from where I hope to burn the CD. I check the md5sum and it doesn't match. What is even stranger is that if I now check the md5sum of the iso file on the usb drive, that has also changed. The size of the file in bytes remains the same, but when I ignored the md5sum and tried to burn the CD anyway, it would not run, so something is wrong. I have tried this dozens of times with a compact flash card formatted fat16, a thumb drive formatted fat32, and another thumb drive that I reformatted ext2, all with the same result. The md5sums are always different, but always wrong. What I would like to know is, do I have defective hardware, or is something else going on? I have never had a problem transferring other, smaller files in this manner. How else can I get this iso file onto my desktop computer? Thanks to anyone who can help me figure this out.
Old 05-05-2010, 06:38 PM   #2
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My guess is that for whatever reason the laptop is not unmounting the usb drive properly. Have you tried the paranoid approach: copy the file to the USB drive, then shut down the laptop. Only once it's fully turned off remove the USB drive and put it in the desktop.
Old 05-07-2010, 04:36 PM   #3
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No, I don't think I did try that, but I will. Thanks for the suggestion. However, I don't think that explains why the md5sum of the iso on the usb should be different from that on the desktop after I have transferred the file. Should I also shut down and restart the desktop before checking the md5?


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