Filesystem support on DVD-RAMs

[Michael Nottebrock]

I recently got an LG GSA-4081B multiwriter, which also supports DVD-RAM. I've 
been quite enthusiastic about finally having a a really big sort-of-floppy 
disk I can use without any packet-writing nonsense & such, so I spent a bit 
of time rebooting and formatting and mounting to find out which filesystem 
would be best suited for carrying around data on DVD-RAMs with me (see table 
below).

Right now it would seem that ext2fs needs to fixed to be able to mount 
filesystems from cd-devices, and newfs_msdos needs to be fixed to create 
filesystems on cd-devices. Furthermore, we probably need some new disktab 
entries for typical DVD-RAM media. I've done all this on a -STABLE machine, 
since the burner is in a -STABLE machine. I've cc'd -current because I'd like 
to know if the situation is any different in -CURRENT / 5.2 and because 
someone might want to append the table with results for UDF 1.5 and UDF 2.0, 
which I didn't bother to test because UDF support still isn't MFC'd.

Some notes on the table: Read+Write NO in Linux and FreeBSD equals "no 
mounting possibe". UFS means UFS1 (newfs from -STABLE was used).


       | FreeBSD    | Linux          | Windows 2000 (with drive-  | Win98 SE |
       | 4.9-Stable | Knoppix-2.4.20 | vendor-supplied driver)    | (plain)  |
------------------------------------------------------------------------------
Fat 32 |            |                |                            |          |
Create |    NO      |       NO       |           YES              |    NO    |
------------------------------------------------------------------------------
Fat 32 |            |                |                            |          |
Read   |    YES     |       YES      |           YES              |    YES   |
------------------------------------------------------------------------------
Fat 32 |            |                |                            |          |
Write  |    YES     |       YES      |           YES              |    NO    |
------------------------------------------------------------------------------
NTFS   |            |                |                            |          |
Create |    NO      |       NO       |           YES              |    NO    |
------------------------------------------------------------------------------
NTFS   |            |                |                            |          |
Read   |    NO      |       YES      |           YES              |    NO    |
------------------------------------------------------------------------------
NTFS   |            |                |                            |          |
Write  |    NO      |    Untested    |           YES              |    NO    |
------------------------------------------------------------------------------
EXT2   |            |                |                            |          |
Create |    YES     |       YES      |           NO               |    NO    |
------------------------------------------------------------------------------
EXT2   |            |                |                            |          |
Read   |    NO      |       YES      |           NO               |    NO    |
------------------------------------------------------------------------------
EXT2   |            |                |                            |          |
Write  |    NO      |       YES      |           NO               |    NO    |
------------------------------------------------------------------------------ 
UFS    |            |                |                            |          |
Create |    YES     |       NO       |           NO               |    NO    |
------------------------------------------------------------------------------
UFS    |            |                |                            |          |
Read   |    YES     |       NO       |           NO               |    NO    |
------------------------------------------------------------------------------
UFS    |            |                |                            |          |
Write  |    YES     |       NO       |           NO               |    NO    |
------------------------------------------------------------------------------


-- 
   ,_,   | Michael Nottebrock               | lofi at freebsd.org
 (/^ ^\) | FreeBSD - The Power to Serve     | http://www.freebsd.org
   \u/   | K Desktop Environment on FreeBSD | http://freebsd.kde.org
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