Root/
| 1 | Getting started quick |
| 2 | --------------------- |
| 3 | |
| 4 | - Select packet support in the block device section and UDF support in |
| 5 | the file system section. |
| 6 | |
| 7 | - Compile and install kernel and modules, reboot. |
| 8 | |
| 9 | - You need the udftools package (pktsetup, mkudffs, cdrwtool). |
| 10 | Download from http://sourceforge.net/projects/linux-udf/ |
| 11 | |
| 12 | - Grab a new CD-RW disc and format it (assuming CD-RW is hdc, substitute |
| 13 | as appropriate): |
| 14 | # cdrwtool -d /dev/hdc -q |
| 15 | |
| 16 | - Setup your writer |
| 17 | # pktsetup dev_name /dev/hdc |
| 18 | |
| 19 | - Now you can mount /dev/pktcdvd/dev_name and copy files to it. Enjoy! |
| 20 | # mount /dev/pktcdvd/dev_name /cdrom -t udf -o rw,noatime |
| 21 | |
| 22 | |
| 23 | Packet writing for DVD-RW media |
| 24 | ------------------------------- |
| 25 | |
| 26 | DVD-RW discs can be written to much like CD-RW discs if they are in |
| 27 | the so called "restricted overwrite" mode. To put a disc in restricted |
| 28 | overwrite mode, run: |
| 29 | |
| 30 | # dvd+rw-format /dev/hdc |
| 31 | |
| 32 | You can then use the disc the same way you would use a CD-RW disc: |
| 33 | |
| 34 | # pktsetup dev_name /dev/hdc |
| 35 | # mount /dev/pktcdvd/dev_name /cdrom -t udf -o rw,noatime |
| 36 | |
| 37 | |
| 38 | Packet writing for DVD+RW media |
| 39 | ------------------------------- |
| 40 | |
| 41 | According to the DVD+RW specification, a drive supporting DVD+RW discs |
| 42 | shall implement "true random writes with 2KB granularity", which means |
| 43 | that it should be possible to put any filesystem with a block size >= |
| 44 | 2KB on such a disc. For example, it should be possible to do: |
| 45 | |
| 46 | # dvd+rw-format /dev/hdc (only needed if the disc has never |
| 47 | been formatted) |
| 48 | # mkudffs /dev/hdc |
| 49 | # mount /dev/hdc /cdrom -t udf -o rw,noatime |
| 50 | |
| 51 | However, some drives don't follow the specification and expect the |
| 52 | host to perform aligned writes at 32KB boundaries. Other drives do |
| 53 | follow the specification, but suffer bad performance problems if the |
| 54 | writes are not 32KB aligned. |
| 55 | |
| 56 | Both problems can be solved by using the pktcdvd driver, which always |
| 57 | generates aligned writes. |
| 58 | |
| 59 | # dvd+rw-format /dev/hdc |
| 60 | # pktsetup dev_name /dev/hdc |
| 61 | # mkudffs /dev/pktcdvd/dev_name |
| 62 | # mount /dev/pktcdvd/dev_name /cdrom -t udf -o rw,noatime |
| 63 | |
| 64 | |
| 65 | Packet writing for DVD-RAM media |
| 66 | -------------------------------- |
| 67 | |
| 68 | DVD-RAM discs are random writable, so using the pktcdvd driver is not |
| 69 | necessary. However, using the pktcdvd driver can improve performance |
| 70 | in the same way it does for DVD+RW media. |
| 71 | |
| 72 | |
| 73 | Notes |
| 74 | ----- |
| 75 | |
| 76 | - CD-RW media can usually not be overwritten more than about 1000 |
| 77 | times, so to avoid unnecessary wear on the media, you should always |
| 78 | use the noatime mount option. |
| 79 | |
| 80 | - Defect management (ie automatic remapping of bad sectors) has not |
| 81 | been implemented yet, so you are likely to get at least some |
| 82 | filesystem corruption if the disc wears out. |
| 83 | |
| 84 | - Since the pktcdvd driver makes the disc appear as a regular block |
| 85 | device with a 2KB block size, you can put any filesystem you like on |
| 86 | the disc. For example, run: |
| 87 | |
| 88 | # /sbin/mke2fs /dev/pktcdvd/dev_name |
| 89 | |
| 90 | to create an ext2 filesystem on the disc. |
| 91 | |
| 92 | |
| 93 | Using the pktcdvd sysfs interface |
| 94 | --------------------------------- |
| 95 | |
| 96 | Since Linux 2.6.20, the pktcdvd module has a sysfs interface |
| 97 | and can be controlled by it. For example the "pktcdvd" tool uses |
| 98 | this interface. (see http://tom.ist-im-web.de/download/pktcdvd ) |
| 99 | |
| 100 | "pktcdvd" works similar to "pktsetup", e.g.: |
| 101 | |
| 102 | # pktcdvd -a dev_name /dev/hdc |
| 103 | # mkudffs /dev/pktcdvd/dev_name |
| 104 | # mount -t udf -o rw,noatime /dev/pktcdvd/dev_name /dvdram |
| 105 | # cp files /dvdram |
| 106 | # umount /dvdram |
| 107 | # pktcdvd -r dev_name |
| 108 | |
| 109 | |
| 110 | For a description of the sysfs interface look into the file: |
| 111 | |
| 112 | Documentation/ABI/testing/sysfs-block-pktcdvd |
| 113 | |
| 114 | |
| 115 | Using the pktcdvd debugfs interface |
| 116 | ----------------------------------- |
| 117 | |
| 118 | To read pktcdvd device infos in human readable form, do: |
| 119 | |
| 120 | # cat /sys/kernel/debug/pktcdvd/pktcdvd[0-7]/info |
| 121 | |
| 122 | For a description of the debugfs interface look into the file: |
| 123 | |
| 124 | Documentation/ABI/testing/debugfs-pktcdvd |
| 125 | |
| 126 | |
| 127 | |
| 128 | Links |
| 129 | ----- |
| 130 | |
| 131 | See http://fy.chalmers.se/~appro/linux/DVD+RW/ for more information |
| 132 | about DVD writing. |
| 133 |
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