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yaml --- r: 40945 b: refs/heads/master c: 55aa601 h: refs/heads/master i: 40943: 6c0fd69 v: v3
git-mirror · Nov 16, 2006 · bdc817d · bdc817d
1 parent 8b487b1
commit bdc817d
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Showing 2 changed files with 12 additions and 3 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: d6ddf55440833fd9404138026af246c51ebeef22
+refs/heads/master: 55aa601e14cbec987fa577a895e9297df1d0a71d
diff --git a/trunk/Documentation/filesystems/udf.txt b/trunk/Documentation/filesystems/udf.txt
@@ -7,8 +7,17 @@ If you encounter problems with reading UDF discs using this driver,
 please report them to linux_udf@hpesjro.fc.hp.com, which is the
 developer's list.
 
-Write support requires a block driver which supports writing. The current
-scsi and ide cdrom drivers do not support writing.
+Write support requires a block driver which supports writing.  Currently
+dvd+rw drives and media support true random sector writes, and so a udf
+filesystem on such devices can be directly mounted read/write.  CD-RW
+media however, does not support this.  Instead the media can be formatted
+for packet mode using the utility cdrwtool, then the pktcdvd driver can
+be bound to the underlying cd device to provide the required buffering
+and read-modify-write cycles to allow the filesystem random sector writes
+while providing the hardware with only full packet writes.  While not
+required for dvd+rw media, use of the pktcdvd driver often enhances
+performance due to very poor read-modify-write support supplied internally
+by drive firmware.
 
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 The following mount options are supported: