On Fri, 16 Oct 2015 18:37:26 +0800 Ed Greshko <ed.gres...@greshko.com> wrote:
> On 10/16/2015 05:35 PM, Ranjan Maitra wrote:
> > On Fri, 16 Oct 2015 12:24:22 +0800 Ed Greshko <ed.gres...@greshko.com>
> > wrote:
> >
> >> On 10/16/2015 12:14 PM, Ranjan Maitra wrote:
> >>> I don't know and I am not an expert. However, from experiment,
> >>> observation and inference, I have noticed that unless the usb is mounted,
> >>> dd does not copy to the device. (This happened as recently as last week).
> >> Sure it does....
> >>
> >> [root@meimei tmp]# cat ones
> >> 111111111111111111111111111111111111111111111111111111111111111111111111111111
> >> 1111111111111111111111111111111111111111111111111111111111111111111111111111111
> >> 111111111111111111111111111111111111111111111111111111111111111111111111111111
> >>
> >> [root@meimei tmp]# df
> >> Filesystem 1K-blocks Used Available Use% Mounted on
> >> devtmpfs 4071532 0 4071532 0% /dev
> >> tmpfs 4082428 327808 3754620 9% /dev/shm
> >> tmpfs 4082428 1520 4080908 1% /run
> >> tmpfs 4082428 0 4082428 0% /sys/fs/cgroup
> >> /dev/sda2 50264772 17507156 30181232 37% /
> >> tmpfs 4082428 96 4082332 1% /tmp
> >> /dev/sdb1 480589520 12122308 444031552 3% /home
> >> /dev/sda1 487652 135783 322173 30% /boot
> >> /dev/sda5 894266040 397001636 451815240 47% /opt
> >> tmpfs 816488 0 816488 0% /run/user/985
> >> ds:/volume1/video 2879621632 1108568832 1770950400 39%
> >> /home/egreshko/Videos
> >> tmpfs 816488 28 816460 1% /run/user/1029
> >>
> >> [root@meimei tmp]# dd if=ones of=/dev/sdg
> >> 0+1 records in
> >> 0+1 records out
> >> 239 bytes (239 B) copied, 0.00298501 s, 80.1 kB/s
> >>
> >> [root@meimei tmp]# cat /dev/sdg | more
> >> 111111111111111111111111111111111111111111111111111111111111111111111111111111
> >> 1111111111111111111111111111111111111111111111111111111111111111111111111111111
> >> 111111111111111111111111111111111111111111111111111111111111111111111111111111
> >>
> >> "f�f�Vf�f!�uf�����r���f�F�������fa��b
> >> f�fFf��0�r�>�}U�����{Z_����
> >> ^���>b��<
> >> u��▒���
> >>
> > And this got copied to the USB device? (I did not say that it was not
> > copied to an arbitrary location, only that it did not get copied to the USB
> > device). Further, it messed up the mount point till reboot.
> >
>
> Of course it was written to the device. That is what /dev/sdg is...
>
> brw-rw----. 1 root disk 8, 96 Oct 16 18:32 /dev/sdg
>
> You need to learn about "block devices". /dev/sdg is the entire device. In
> this case a USB thumb drive. In my case,
>
> brw-rw----. 1 root disk 8, 96 Oct 16 18:32 /dev/sdg1 also exists, when the
> thumb drive is inserted, since there is a single partition defined on the
> drive.
>
> These are *not* mount points.
>
OK, I stand corrected, thanks!
Ranjan
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