File privileges problem on USB thumbdrive

[Colin Law]

On Sun, 16 Aug 2020, 23:01 Bret Busby, <bret.busby at gmail.com> wrote:

> On 17/08/2020, Colin Law <clanlaw at gmail.com> wrote:
> > On Sun, 16 Aug 2020 at 20:10, Bret Busby <bret.busby at gmail.com> wrote:
> >>
> >> Hello.
> >>
> >> This applies equally to UbuntuMATE 20.04.x and 16.04.x .
> >>
> >> I have a USB thumbdrive, which is formatted as FAT32.
> >>
> >> I want to move the files written to it, to another medium, so as to
> >> reuse the thumbdrive for writing.
> >>
> >> I have previously done this, with this thumbdrive, and, with other
> >> thumbdrives of the same model, capacity (128GB), and manufacturer.
> >>
> >> However, now, whilst file managers (caja and PCmanFM) show me, as the
> >> owner of the files, with Read and write folder access, no file access
> >> privilege is shown in the caja file manager, and, I can not use cut
> >> (and thence paste to another destination) or rename functionality on
> >> the files, and, trying to use chmod 777 and sudo chmod 777 , both
> >> return the error "file system is read only".
> >>
> >> ls  -l shows
> >> -rw -r--r--
> >> for the files.
> >>
> >> As I am supposed to be able, as the shown owner of the files, both
> >> read and write to, the files, why does the operating system designate
> >> them as read-only, and, how do I overcome this?
> >
> > Apologies in advance, but I have to ask whether you have checked that
> > the write protect switch on the drive (if there is one) is in the
> > correct state?
> >
> > Otherwise are you able to write to it on a Windows system?  It is
> > possible that it is broken.
> >
> > It might be worth watching the log while you plug it in, it might
> > indicate why it is read only.
> > sudo journalctl -f
> > or
> > sudo tail -f /var/log/syslog
> >
> > Colin
> >
>
> I last wrote to it about five or six hours ago (via a television set
> top box - recorded a television program).
>
> "
> Mon Aug 17 05:51:37 bret at bret-MD34045-2521:~$sudo tail -f /var/log/syslog
> Aug 17 05:52:19 bret-MD34045-2521 kernel: [782634.497686] sd 8:0:0:0:
> Attached scsi generic sg4 type 0
> Aug 17 05:52:19 bret-MD34045-2521 kernel: [782634.498301] sd 8:0:0:0:
> [sdd] 245760000 512-byte logical blocks: (126 GB/117 GiB)
> Aug 17 05:52:19 bret-MD34045-2521 kernel: [782634.498563] sd 8:0:0:0:
> [sdd] Write Protect is off
> Aug 17 05:52:19 bret-MD34045-2521 kernel: [782634.498564] sd 8:0:0:0:
> [sdd] Mode Sense: 23 00 00 00
> Aug 17 05:52:19 bret-MD34045-2521 kernel: [782634.498736] sd 8:0:0:0:
> [sdd] Write cache: disabled, read cache: disabled, doesn't support DPO
> or FUA
> Aug 17 05:52:19 bret-MD34045-2521 kernel: [782634.527747]  sdd: sdd1
> Aug 17 05:52:19 bret-MD34045-2521 kernel: [782634.528525] sd 8:0:0:0:
> [sdd] Attached SCSI removable disk
> Aug 17 05:52:20 bret-MD34045-2521 kernel: [782635.879551] FAT-fs
> (sdd1): Volume was not properly unmounted. Some data may be corrupt.
> Please run fsck.
> Aug 17 05:52:20 bret-MD34045-2521 systemd[1]: Finished Clean the
> /media/bret/10C0-C930 mount point.
> Aug 17 05:52:21 bret-MD34045-2521 udisksd[1146]: Mounted /dev/sdd1 at
> /media/bret/10C0-C930 on behalf of uid 1000
> Aug 17 05:52:34 bret-MD34045-2521 tracker-store[1066020]: OK
> Aug 17 05:52:34 bret-MD34045-2521 systemd[1720]:
> tracker-store.service: Succeeded.
> Aug 17 05:53:04 bret-MD34045-2521 kernel: [782679.480574] [UFW BLOCK]
> IN=wlp2s0 OUT= MAC=01:00:5e:00:00:01:50:d4:f7:70:10:95:08:00
> SRC=192.168.1.1 DST=224.0.0.1 LEN=36 TOS=0x00 PREC=0x00 TTL=1 ID=0 DF
> PROTO=2
> Aug 17 05:53:09 bret-MD34045-2521 kernel: [782684.318747] FAT-fs
> (sdd1): error, fat_bmap_cluster: request beyond EOF (i_pos 0)
> Aug 17 05:53:09 bret-MD34045-2521 kernel: [782684.318749] FAT-fs
> (sdd1): Filesystem has been set read-only
>


Well that is quite clear, the file system is corrupted. You could try fsck
as suggested but I suspect you may have to reformat.

Colin

Aug 17 05:53:29 bret-MD34045-2521 kernel: [782704.617339] FAT-fs
> (sdd1): error, fat_bmap_cluster: request beyond EOF (i_pos 960514)
> Aug 17 05:53:29 bret-MD34045-2521 dbus-daemon[1743]: [session uid=1000
> pid=1743] Activating via systemd: service
> name='org.freedesktop.Tracker1' unit='tracker-store.service' requested
> by ':1.2' (uid=1000 pid=1740 comm="/usr/libexec/tracker-miner-fs "
> label="unconfined")
> Aug 17 05:53:29 bret-MD34045-2521 systemd[1720]: Starting Tracker
> metadata database store and lookup manager...
> Aug 17 05:53:29 bret-MD34045-2521 dbus-daemon[1743]: [session uid=1000
> pid=1743] Successfully activated service 'org.freedesktop.Tracker1'
> Aug 17 05:53:29 bret-MD34045-2521 systemd[1720]: Started Tracker
> metadata database store and lookup manager.
> ^C
> "
>
>
> --
> Bret Busby
> Armadale
> West Australia
> ..............
>
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