thanks for the suggestions.

The filesystem on the usb hard drive does not have a 2GB limit - it
already has several backup image files well over 100GB each.

I tried the system rescue cd, it gave a similar error of "cp: failed to
extend './filename' : Input/output error".

It was mounted with ntfs-3g. Could ntfs-3g have a limit?  I read it
depends on something called 'fuse' (filesystem in userspace), it always
mounts as type 'fuseblk' - maybe this has a limit?

This is all being done on a laptop. I made mistake in original post -
laptop has a 'ext4' partition, not 'ext3', in case this generates more
ideas.
The file I'm trying to copy is a truecrypt container, but that shouldn't
make any difference I would think.

I'm open to any further suggestions please (I need to get this file
copied to another machine and I don't have any other drives that are
free to format up as another filesystem, so I'm stuck with these ntfs
drives) ...

cheers, Bryce.


________________________________

        From: [email protected]
[mailto:[email protected]] On Behalf Of
Christopher Sawtell
        Sent: Friday, August 10, 2012 12:14 PM
        To: Canterbury Linux Users Group
        Subject: Re: [Linux-users] Error copying large file to ntfs
formatted usb drive?


        On 10 August 2012 11:45, Bryce Stenberg <[email protected]>
wrote:


                Hi,

                I'm trying to copy an 18GB file from my linux partition
(ext3) to an
                external hard drive that is NTFS formatted (gets used
mostly by windows
                machines hence ntfs) which has 40GB free space.

                No matter what I've tried the copy gets to 2GB and then
fails with
                "Error splicing file: Input/Output error".



        http://www.sysresccd.org/SystemRescueCd_Homepage

        and


http://www.sysresccd.org/Sysresccd-manual-en_Mounting_an_NTFS_partition_
with_full_Read-Write_support

        http://www.sysresccd.org/Download

        --
        Sincerely,
        Christopher Sawtell






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