From 508c85026d0e0db290faf2b11964b1b009688e71 Mon Sep 17 00:00:00 2001 From: Thomas Schmitt Date: Tue, 7 Jul 2020 13:57:20 +0000 Subject: [PATCH] --- Writing.md | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) create mode 100644 Writing.md diff --git a/Writing.md b/Writing.md new file mode 100644 index 0000000..205cc0f --- /dev/null +++ b/Writing.md @@ -0,0 +1,36 @@ +Writing in the context of libburnia means the transfer of a byte stream +onto optical media or into disk filesystem objects which are handled +much like optical media. + +The various types of optical media show quite different capabilities +and behavior. CD media can carry raw audio streams as well as data +blocks which are protected by checksums and error correction. DVD +and BD media can only carry data blocks. Eventual audio or video +information is encoded in these blocks and not in raw streams. + +There is the class of multi-session media: +CD-R, CD-RW, DVD-R, DVD-RW, DVD+R, BD-R, which have a table of +content describing their session history. They may only be written +sequentially and in large sessions. + +The other class is the one of overwriteable media: +formatted DVD-RW, DVD+RW, DVD-RAM, BD-RE, which +offers no session history but can perform random access +writing with a certain granularity. + +libburnia performs its writing via [libburn](Libburn) which +demands a certain respect towards the peculiarities of the media +type. Under the special assumption that only ISO 9660 filesystems +with Rock Ridge extensions get written, [libisoburn](Libisoburn) +offers writing capabilities which are nearly independent of the media +type. + +libburnia has two programs which perform writing under command +line control: cdrecord-emulator [cdrskin](Cdrskin), and +ISO 9660 multi-session tool [xorriso](Xorriso). + +Formatted CD-RW are not yet supported by libburn. + +Regular disk files and block devices may be used like overwriteable +media. Other disk filesystem objects may be used as empty +multi-session media.