[xubuntu-users] Peculiarities with copying large files to a flash drive, Xubuntu 12.04

Greg Zeng gregzeng at gmail.com
Tue Jun 12 09:11:42 UTC 2012

NTFS-3G, NTFS-Vista, NTFS- Win7 ... are each three very different &
incompatible products.  Wikipedia yourself on this.  When you force a
hostile file format onto flash memory (like NTFSxx) - it has, as you
discovered, unpredictable resulmatts.

All flash-drive-only specialized apps suggest formats FAT16  or FAT32.
 Flash drives are electronic gadgets very different to magnetic
drives.  I think this is your "error".

On 6/12/12, Pasi Lallinaho <pasi at shimmerproject.org> wrote:
> Forwarding this mail to xubuntu-users, which is appropriate.
> Pasi
> On 06/11/2012 10:00 PM, Len E. wrote:
>> (The situation described herein may be of interest
>>   to the development team).
>> A large .iso file (Debian 6.0.5 DVD), 4.4GB size, which
>> had been downloaded from the Debian website was copied
>> to an 8GB flash drive formatted as NTFS.  The checksum,
>> using MD5calc from the terminal command line, matched
>> with the posted value on the website, both for the
>> downloaded file, and the file copy on the flash drive.
>> When the flash drive was mounted on a Vista PC (which
>> has the DVD burner), the checksum value calculated there,
>> both on the flash drive and on the file copied to the
>> Vista hard disk did not match the posted value.
>> What was most unusual, was that when the flash drive
>> was remounted onto the Xubuntu machine, the checksum
>> value no longer matched the posted value, even though
>> no further write operations to the flash drive had
>> occurred.
>> This process was repeated a few times, alternately
>> using the cp terminal command, and a copy/paste operation
>> to transfer the .iso file to the flash drive.
>> (Between attempts, the flash drive was reformatted to NTFS
>> using Gparted on Xubuntu).   The peculiar results were
>> the same with each attempt.
>> The final attempt was to put the .iso file into a tar
>> archive on Xubuntu, then cp the archive onto the flash
>> drive.  On Vista, the 7zip utility was used to extract the
>> .iso from the tar archive.
>> The checksum for the extracted .iso file DID MATCH THE
>> I don't really understand what is happening, but I'm
>> pleased to have a work-around using the tar archive if
>> I have similar large-file transfer requirements in the
>> future.
>> For your consideration .....
> --
> Pasi Lallinaho (knome)                      » http://open.knome.fi/
> Leader of Shimmer Project and Xubuntu       » http://shimmerproject.org/
> Graphic artist, webdesigner, Ubuntu member  » http://xubuntu.org/
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