Very Computer

1)  The file system, CDFS, which Windows et al use for rewriting data
(floppy-like) onto a CDROM doesn't seem to be there.  Is this being added
at any known time?  (No, I don't have the skills to write the driver
myself.  Sorry.)  I'm a little surprised because Linux has so many file
systems already...

2)  The device name isn't steady.  I think the CDRW was /dev/scd3 when I
was "root" but then scd0 when I logged in again under my regular username!
Is there supposed to be some fixed formula by which emulated SCSI numbers
are assigned?  Or is this a bug?

Many thanks.
--
Fred R. Goldstein   k1io   fgoldstein"at" wn.net
These are my own opinions. You expect anyone else to agree?

Quote:>Is this being added at any known time?  (No, I don't have the skills
>to write the driver myself.  Sorry.)  I'm a little surprised because
>Linux has so many file systems already...

/* ------------------------------------------------------------------
 * Linux(r) UDF Filesystem Driver
 * Version: 0.9.0
 * --------------------------------------------------------------- */

REQUIRED:
        Linux version 2.1.70 or higher

COMPILING:
        type: "make udf.o"

INSTALLING:
        type: "make install"

KERNEL PATCH:
        type: "make patch"

TESTING:
        type "depmod -a"
        type "modprobe udf",
        then "mount -t udf /dev/scd0 /mnt"
                (assuming /dev/scd0 is your scsi cdrom)
    or
         "mount -t udf -o loop image /mnt"
                (Substitute "scd0", "image",  and "/mnt" as appropriate for your system)

    with a subject of "Get UDF Sample Discs Access". You should get the URL
    sent back within 5 minutes.

If you want to help out, subscribe to the linux_udf mailing list below.

OSTA-UDF
    Optical Storage Technology Association Universal Disk Format

The Linux UDF development team mail list is:

Subscribe to the mailing list by sending a message to:

with a body of:
    subscribe linux_udf

UDF developers should subscribe to additional lists:
    subscribe osta_tc
    subscribe osta_cd_dvd

Documentation on UDF and ECMA 167 is available FREE from:
    http://www.osta.org/
    http://www.ecma.ch/

73, Mario
--

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There is definitely a project underway to add read-only, write-once
(CD-R), and write-many (CD-RW) UDF support to Linux.  Last I checked,
they had CD-RW support working pretty well, on both ATAPI and SCSI
CD-RW drives (MMC command set required).  CD-R support would appear
once CD-RW was stable.

Adding  support  for   read-only  UDF isn't too hard, it seems.  Adding
support  for  read/write (either  -once  or  -many) looked as if it was
very nontrivial - it requires patching the kernel's basic
VM-and-buffer-management layer, in order to ensure that data is
written from the buffer cache in chunks which are the size required by
a packet-mode CD-RW.

Quote:>2)  The device name isn't steady.  I think the CDRW was /dev/scd3 when I
>was "root" but then scd0 when I logged in again under my regular username!
>Is there supposed to be some fixed formula by which emulated SCSI numbers
>are assigned?  Or is this a bug?

--

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