Re: Disk Access
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On Sun, Jul 02, 2017 at 06:42:55PM +0100, David wrote:
> On Sat, 2017-07-01 at 17:35 +0200, email@example.com wrote:
> > On Sat, Jul 01, 2017 at 04:22:29PM +0100, David wrote:
> > > Dear List,
> > >
> > > I am using Linux Mint Debian (Betsy) and I'm having problems writing to
> > > removable hard disks.
> > >
> > > There are no problems reading and writing to USB sticks.
> > >
> > > But removable sata disks I can read, but not write to. These disks are
> > > in caddies that are designed to be removed.
> > >
> > > I thought the problem was because one of the disks in question was not
> > > formatted on the Mint machine, so I formatted a new disk, same problem.
> > >
> > > Can anybody offer me a solution?
> > What file system are those disks formatted with?
> > Things to check:
> > - what are the permissions of the files/directories you try to
> > write to?
> > - is the whole disk perhaps mounted read only?
> > You may get some hints from the error message when you try the
> > write or from the log files, e.g. /var/log/messages (at mount
> > time).
> > > Would I have the same problem if I used native Debian?
> > Difficult to say without more hints.
> > Cheers
> > -- tomás
> Sorry I should have given more details.
> The disks are formatted to EXT4 and they do appear to be read only.
> The attached details below are the results from /var/log/messages
> The first part is a disk that has files on it that I can read, but I
> cannot write to it.
> The second part is a new disk that I have recently formatted and has no
> data on it. Trying to mount this second disk previously I got a message
> about dbus, but I didn't this time.
> What I would like to do is to create directories and copy files into
> those directories to create a backup.
Hmm. this (from the first log snippet) looks at least suspicious:
> Jul 2 18:26:08 david-mint-debian kernel: [ 336.603699] EXT4-fs (sdb1):
> warning: mounting fs with errors, running e2fsck is recommended
I'd expect a file system with errors to be mounted read-only
(although I can't see any hint towards that in the log itself:
I would expect a noice to that effect).
BTW, this hints against Hans's guess that only FAT or NTFS are
auto-mounted. This file system is being mounted.
Now the error message when trying to write to the file system
becomes the more interesting. I'd suggest you try t from a terminal:
You can try that with "touch". Assuming /some/directory is a directory
on your file system, and there's no file in there called "foo",
you might try
This would try to create an (empty) file foo there. You might get
"permission denied" or "mumble mumble read-only file system".
But, first of all: if your data is valuable there, make a backup
and run a file system check!
- -- tomás
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