UDF write support
Reinoud Zandijk has been working on support for the
Universal Disk Format
in NetBSD for quite some time, and in mid-may he has
major mile stone by adding write support to NetBSD's UDF file system:
``It can now read and *write* files and
directories on CD-R, CD-RW, CD-MRW, DVD-R, DVD+R, DVD-RW, DVD+RW, DVD+MRW,
(USB) flash media and harddisc partitions. Media like Iomega Rev should
also work fine since they attach to the cd(4) device.
Rewritable media needs to be optionally blanked and then (packet) formatted
first using the new mmcformat(8) tool. This will format the disc to be
usable for UDF. For the drives that support it, you can also format CD-MRW
and DVD+MRW wich give background formatting and a precieved error free
For recordable media and non optical media a newfs_udf(8) is enough. See
the manpage for the various options. Note that the UDF version specifying
is still a bit odd, it needs to be done in hex.
As for recordable optical media, for formatting and newfsing you need to
specify the specify the raw complete disc i.e. /dev/rcd0c or /dev/rcd0d (on
For all other media (i.e. NOT optical media), one has the choice to
completely use the disc by using the complete device extent or to use a
partition scheme. newfs_udf(8) will use the complete partition specified.
Discs can be mounted with mount_udf(8). Supported options next to the UDF
specific options are async and noatime.
Current limitations are that disc accounting is not done correctly yet so
be carefull not to run out of space on disc and that writing to metadata
partitions is not implemented yet. Also fsck_udf(8) is not yet finished,
but will be added later.''
[Tags: filesystem, udf]