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Simple advanced question
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MOUNT_UDF(8) BSD System Manager's Manual MOUNT_UDF(8) NAME
mount_udf -- mount a UDF filesystem SYNOPSIS
mount_udf [-o options] [-s sessionStart] [-n lastRecordedLBA] [-b blockSize] [-p packetSizeInBlocks] [-v verificationPolicy] [-w] devicePath mountPath DESCRIPTION
The mount_udf command attaches the UDF filesystem residing on the device devicePath to the global filesystem namespace at the location indi- cated by mountPath. This command is normally executed by mount(8) at boot time. The options are as follows: -o options Options are specified with a -o flag followed by a comma separated string of options. See the mount(8) man page for possible options and their meanings. -v verificationPolicy This is an advanced option not useful for regular use. It controlls the verification policy when writing to RW type optical media. Its value can be "meta", "all", or "none". Policy "meta" means only the metadata are verified after they are written. This is the default policy. Policy "all" means to verify data written, which could be several times slower than policy "meta". Policy "none" does not verify any data. It is only slightly faster than "meta" in normal cases, but may result a corrupted UDF disc if the write of metadata fails. -s sessionStart This is an advanced option not useful for regular use. When manually mounting a UDF volume with Virtual Partition, it specifies the start Logical Block Address of the last session where UDF data structures (VRS and AVDP) resides. This value overrides the value obtained from the device. -n lastRecordedLBA This is an advanced option not useful for regular use. When manually mounting a UDF volume with Virtual Partition, it specifies the last recorded Logical Block Address where the UDF VAT ICB will be searched. This value overrides the value obtained from the device. -b blockSize This is an advanced option not useful for regular use. It specifies the block size in bytes used when mounting the UDF volume. This value overrides the value obtained from the device. -p packetSizeInBlocks This is an advanced option not useful for regular use. It specifies the packet size in blocks when manually mounting the UDF volume. This value overrides the value obtained from the device. -w This is an advanced option not useful for regular use. It forces to enable the experimental packet writing function on optical media that has not been fully supported, such as CD-R, CD-RW, DVD-R, DVD+R, HD DVD-R, and BD-R. Writing to these media does not work on some drives and may cause data corruption or data loss on some other drives. Therefore, this flag should be used only by file system developers when debugging the experimental write functions. The -s, -n, -b, and -p flags are not useful in normal use. They are mainly used for debugging and data recovery. Since the -s, -n, and -p flags are all specified in units of block size, when any of these flags are specified, it is strongly recommended that the -b flag is also specified. SEE ALSO
mount(2), unmount(2), fstab(5), mount(8) BUGS
Reading of all UDF revisions (1.02 - 2.60) on both block device (e.g., hard drives and USB drives) and most optical media is supported. Writing to block devices, DVD-RW and DVD+RW is supported with the following exceptions: (1) Cannot write Finder Info, Resource Fork, or other extended attributes in UDF volumes of revision 1.02 and 1.50; (2) Cannot write to mirrored metadata partition. HISTORY
The mount_udf utility first appeared in Mac OS X. 4th Berkeley Distribution December 6, 2006 4th Berkeley Distribution
