User:Yminus:Packet writing on optical discs (UDF)

What's it about?
"Packet writing or IPW (original term: Incremental Packet Writing), is an optical disc recording technology used to allow write-once and rewritable CD and DVD media to be used in a similar manner to a floppy disk from within the operating system, i.e., it allows users to create, modify, and delete files and directories on demand without the need to burn a whole disc. Packet writing technology achieves this by writing data in incremental blocks rather than in a single block. The most common file system for packet writing systems is the UDF format."

Requirements
Blu-ray Disc/DVD+RW/+R/-R(W) for Linux
 * >=sys-kernel/gentoo-sources-2.6.10 (tested on 2.6.39-r3)
 * >=app-cdr/cdrtools-2.0 for BD-R/DVD±R multisessioning (mkisofs) or a patched version (tested with 3.0)

Limitations

 * It is not possible to burn videos on blu-ray discs that can be played on standard blu-ray players. This is a limitation in mkudffs from sys-fs/udftools, which does not support UDF 2.5. Opensource Software kann keine Blurays brennen (de)
 * Deleting files and directories of a CD-R using packet writing technology does not recover the space occupied by these objects but are simply marked as being deleted. Similarly, changes to files cause new instances to be created instead of replacing the original files. Packet writing
 * DVD+RW media can sustain only around 1000 overwrites. Blu-ray Disc/DVD+RW/+R/-R(W) for Linux
 * To cope with worn out contents the packet writing system can remap bad sectors with good sectors as required. These bad sectors cannot be recovered by formatting the media. Packet writing

Kernel configuration
Make sure that packet writing and the udf filesystem are supported by your kernel.

Take a look at the Gentoo Linux Kernel Configuration Guide to see how to check and change your kernel configuration.

If you prefer to build these options as a module (M), make sure they get loaded automatically: