writing data to disk message... when safely remove USB drive

[Basil Chupin]

On 05/05/13 20:10, Jkhatri wrote:
> On Sunday 05 May 2013 03:31 PM, Colin Law wrote:
>> On 5 May 2013 10:54, Jkhatri<khatri.jatin at gmail.com>  wrote:
>>> Dear ALL
>>>
>>> I'm facing one strange issue, whenever I copy some data to USB thumb drive (
>>> some big files, say 2GB .avi or something) its displays progress bar on
>>> screen that data is being copied to disk and finally it finished but strange
>>>
>>>
>>> why like that ???
>>>
>>> several minutes after the copy before attempting to eject you should
>>> find it then ejects immediately (as the write is complete).  If it
>>> becomes very slow on a particular stick that probably means that it is
>>> failing as it takes longer to write as the flash wears out.
>>>
>>> Colin
>>>
> Thanks for your quick reply, colin
>
> but same drive works fine with M$ windows, on same PC ( dual boot ). 
> it copies same file quickly, and I'm able to eject it as soon as copy 
> process completed. But it takes long time in Ubuntu it takes dual 
> time, like  copy time + safely remove message progress bar time
>
> both windows and Ubuntu are 64bit version and installed on same laptop 
> ( dual boot )
>
> Thanks

You get fast copying in M$ because the stick is formatted in msdos.

Writing from Linux to a msdos formatted drive, such as your USB stick, 
takes "for ever". There is a very complicated explanation for this but 
believe me it is true (something to do with the kernel).

Format the USB stick in a linux format, say ext4, and you will find that 
the copying will be fast (and even faster if the USB is usb3 and 
connected to your usb3 port on your computer; usb2 you will get around 
28MB/s but with usb3 you should get around 110MB/s [but depending on the 
brand of stick you have]).

BC

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