Robert Nichols wrote:
> Paolo Galtieri wrote:
>> I tried to copy a file from my hard disk to a USB flash drive using drag
>> and drop and the nautilus file manager. When I did this a file
>> operations window popped up showing progress of the copy. It stopped at
>> 245.5Mb of 278.6Mb, however, when you look at the destination file it is
>> in fact all there. Doing an md5sum of the source file and the
>> destination file shows them to be the same. I removed the destination
>> file and tried the copy again, and this time it stopped at 246.5Mb of
>> 278.6Mb. If I try to unmount the USB drive it fails with volume is
>> busy, even though the file has been copied over completely. If I try to
>> force the unmount it fails with volume busy. Eventually (after about 5
>> minutes) it seems to finally recognize that the copy is complete and
>> allows me to unmount the drive. If the file has completed copying why
>> does the nautilus file operation popup take a long time before it goes away?
>>
>> No matter how many times I do the copy the nautilus file operation popup
>> takes several minutes to report completion.
>>
>> I'm running F12 with all the latest updates.
>
> Nautilus is waiting for fsync() to return, indicating that the data has
> actually been written to the device. Unmounting is similarly waiting for
> the writes to complete. When you think you are looking at the file on
> the device, all you are really seeing is the data in the kernel's buffer
> cache. Writes to USB drives max out at around 30MB/s, so you should
> expect it to take 9 minutes or more to transfer that 278MB file.
That calculation, of course, makes no sense. At 30MB/s a 278MB transfer
would take 9.2 _seconds_, not 9 minutes. However, USB flash drives do not
achieve anywhere near 30MB/s for writes. Five or 6 minutes is a quite
likely time for a 278MB transfer to most commonly available flash drives.
--
Bob Nichols "NOSPAM" is really part of my email address.
Do NOT delete it.
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