1 ==============
2 Packet writing
3 ==============
4
5 Getting started quick
6 ---------------------
7
8 - Select packet support in the block device se
9 the file system section.
10
11 - Compile and install kernel and modules, rebo
12
13 - You need the udftools package (pktsetup, mku
14 Download from https://github.com/pali/udftoo
15
16 - Grab a new CD-RW disc and format it (assumin
17 as appropriate)::
18
19 # cdrwtool -d /dev/hdc -q
20
21 - Setup your writer::
22
23 # pktsetup dev_name /dev/hdc
24
25 - Now you can mount /dev/pktcdvd/dev_name and
26
27 # mount /dev/pktcdvd/dev_name /cdrom -
28
29
30 Packet writing for DVD-RW media
31 -------------------------------
32
33 DVD-RW discs can be written to much like CD-RW
34 the so called "restricted overwrite" mode. To
35 overwrite mode, run::
36
37 # dvd+rw-format /dev/hdc
38
39 You can then use the disc the same way you wou
40
41 # pktsetup dev_name /dev/hdc
42 # mount /dev/pktcdvd/dev_name /cdrom -
43
44
45 Packet writing for DVD+RW media
46 -------------------------------
47
48 According to the DVD+RW specification, a drive
49 shall implement "true random writes with 2KB g
50 that it should be possible to put any filesyst
51 2KB on such a disc. For example, it should be
52
53 # dvd+rw-format /dev/hdc (only neede
54 been forma
55 # mkudffs /dev/hdc
56 # mount /dev/hdc /cdrom -t udf -o rw,n
57
58 However, some drives don't follow the specific
59 host to perform aligned writes at 32KB boundar
60 follow the specification, but suffer bad perfo
61 writes are not 32KB aligned.
62
63 Both problems can be solved by using the pktcd
64 generates aligned writes::
65
66 # dvd+rw-format /dev/hdc
67 # pktsetup dev_name /dev/hdc
68 # mkudffs /dev/pktcdvd/dev_name
69 # mount /dev/pktcdvd/dev_name /cdrom -
70
71
72 Packet writing for DVD-RAM media
73 --------------------------------
74
75 DVD-RAM discs are random writable, so using th
76 necessary. However, using the pktcdvd driver c
77 in the same way it does for DVD+RW media.
78
79
80 Notes
81 -----
82
83 - CD-RW media can usually not be overwritten m
84 times, so to avoid unnecessary wear on the m
85 use the noatime mount option.
86
87 - Defect management (ie automatic remapping of
88 been implemented yet, so you are likely to g
89 filesystem corruption if the disc wears out.
90
91 - Since the pktcdvd driver makes the disc appe
92 device with a 2KB block size, you can put an
93 the disc. For example, run::
94
95 # /sbin/mke2fs /dev/pktcdvd/dev_name
96
97 to create an ext2 filesystem on the disc.
98
99
100 Using the pktcdvd sysfs interface
101 ---------------------------------
102
103 Since Linux 2.6.20, the pktcdvd module has a s
104 and can be controlled by it. For example the "
105 this interface. (see http://tom.ist-im-web.de/
106
107 "pktcdvd" works similar to "pktsetup", e.g.::
108
109 # pktcdvd -a dev_name /dev/hdc
110 # mkudffs /dev/pktcdvd/dev_name
111 # mount -t udf -o rw,noatime /dev/pktc
112 # cp files /dvdram
113 # umount /dvdram
114 # pktcdvd -r dev_name
115
116
117 For a description of the sysfs interface look
118
119 Documentation/ABI/testing/sysfs-class-pktcdv
120
121
122 Using the pktcdvd debugfs interface
123 -----------------------------------
124
125 To read pktcdvd device infos in human readable
126
127 # cat /sys/kernel/debug/pktcdvd/pktcdv
128
129 For a description of the debugfs interface loo
130
131 Documentation/ABI/testing/debugfs-pktcdvd
132
133
134
135 Links
136 -----
137
138 See http://fy.chalmers.se/~appro/linux/DVD+RW/
139 about DVD writing.
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