SD card suddenly read-only

Emanoil Kotsev deloptes at yahoo.com
Wed Oct 15 15:36:01 BST 2008


--- On Wed, 10/15/08, Jonas Norlander <jonorland at gmail.com> wrote:

> From: Jonas Norlander <jonorland at gmail.com>
> Subject: Re: SD card suddenly read-only
> To: deloptes at yahoo.com, "Kubuntu Help and User Discussions" <kubuntu-users at lists.ubuntu.com>
> Date: Wednesday, October 15, 2008, 3:33 PM
> 2008/10/15 Emanoil Kotsev <deloptes at yahoo.com>:
> > --- On Wed, 10/15/08, Jonas Norlander
> <jonorland at gmail.com> wrote:
> >
> >> From: Jonas Norlander <jonorland at gmail.com>
> >> Subject: Re: SD card suddenly read-only
> >> To: deloptes at yahoo.com, "Kubuntu Help and
> User Discussions"
> <kubuntu-users at lists.ubuntu.com>
> >> Date: Wednesday, October 15, 2008, 1:02 PM
> >> 2008/10/15 Emanoil Kotsev
> <deloptes at yahoo.com>:
> >> > --- On Tue, 10/14/08, Dotan Cohen
> >> <dotancohen at gmail.com> wrote:
> >> >
> >> >> From: Dotan Cohen
> <dotancohen at gmail.com>
> >> >> Subject: Re: SD card suddenly read-only
> >> >> To: "Kubuntu Help and User
> Discussions"
> >> <kubuntu-users at lists.ubuntu.com>
> >> >> Date: Tuesday, October 14, 2008, 4:27 PM
> >> >> 2008/10/14 Jason Straight
> >> >> <jason at jeetkunedomaster.net>:
> >> >> > you can format it with linux as well
> - sudo
> >> mkfs.vfat
> >> >> -F32 /dev/[sdcard]
> >> >> >
> >> >> > or -F16 if you want fat16.
> >> >> >
> >> >>
> >> >> Thanks. I've found that Windows
> machines are
> >> picky
> >> >> about USB storage
> >> >> formated on Linux, especially when using
> UTF-8
> >> filenames.
> >> >>
> >> >> --
> >> >> Dotan Cohen
> >> >>
> >> >
> >> > I don't remember that FAT has UTF
> support. There
> >> for you specify it as mount option. The formatting
> has
> >> nothing to do with it.
> >> >
> >> > Correct me if I'm wrong.
> >> >
> >> > regards
> >> >
> >>
> >> I think you are wrong :-)
> >>
> >> If i remember right VFAT/FAT32 Long File Names can
> have up
> >> to 255
> >> UTF-16 codec characters. I don't know if you
> can have
> >> Long file names
> >> in FAT16 but I'm sure wikipedia has the
> answer.
> >>
> >> / Jonas
> >
> > Why should I then specify the codepage and iocharset
> as a mount option if it was all about UTF?
> 
> It's not all about UTF, FAT is an _old_ filesystem and
> it's still
> needs to read and store the filenames in the
> "old" format to be
> backward compatibility besides the vfat UTF-16 encoded
> names.
> 
> You need the iocharset mount option in order for non-ASCII
> characters
> in file names to be interpreted properly and it should be
> the same as
> the character set of your locale. So if you have a UTF-8
> locale it
> should be set to utf8
> 
> You need the codepage to do the conversion from long to
> short file
> names and it should be set to the codepage number used
> under MS-DOS in
> your country.

This all applies to Dotans issue.

> 
> 
> > besides utf is not unicode - the specification says
> unicode. Windows is talking also about unicode.
> UTF (Unicode Transformation Format) is a variable-length
> character
> encoding for Unicode. There are several ways to encode
> Unicode, to
> name a few UTF-1, UTF-7, UTF-8 and UCS-4 there are all
> unicode just
> different ways how to encode them.

As far as I remember unicode and utf  were developed seperately and  unified  post factum, but this is irelevant now.

> 
> > I think Dotans problem is useing default values which
> corresponds to western chars ... but of course I'm not
> sure about it.
> > most file names are may be in the iso8859 table but
> having one in hebrew breaks his task ... as far as I
> understood
> >
> > regards
> >
> 
> Yes i think so to. Perhaps someday all layers involving
> characters
> will work with unicode and we dont have to care about all
> this
> conversation.
> 
> / Jonas

thanks for explaining all of this. Think now it's clear to everyone

regards



      



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