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[20080610] 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 reached another 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 media.

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 i386, amd64).

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.''

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