Based on kernel version 4.16.1. Page generated on 2018-04-09 11:52 EST.
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-class-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.