1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
98 lines
2.9 KiB
Plaintext
98 lines
2.9 KiB
Plaintext
Getting started quick
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---------------------
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- Select packet support in the block device section and UDF support in
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the file system section.
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- Compile and install kernel and modules, reboot.
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- You need the udftools package (pktsetup, mkudffs, cdrwtool).
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Download from http://sourceforge.net/projects/linux-udf/
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- Grab a new CD-RW disc and format it (assuming CD-RW is hdc, substitute
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as appropriate):
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# cdrwtool -d /dev/hdc -q
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- Setup your writer
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# pktsetup dev_name /dev/hdc
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- Now you can mount /dev/pktcdvd/dev_name and copy files to it. Enjoy!
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# mount /dev/pktcdvd/dev_name /cdrom -t udf -o rw,noatime
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Packet writing for DVD-RW media
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-------------------------------
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DVD-RW discs can be written to much like CD-RW discs if they are in
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the so called "restricted overwrite" mode. To put a disc in restricted
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overwrite mode, run:
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# dvd+rw-format /dev/hdc
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You can then use the disc the same way you would use a CD-RW disc:
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# pktsetup dev_name /dev/hdc
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# mount /dev/pktcdvd/dev_name /cdrom -t udf -o rw,noatime
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Packet writing for DVD+RW media
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-------------------------------
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According to the DVD+RW specification, a drive supporting DVD+RW discs
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shall implement "true random writes with 2KB granularity", which means
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that it should be possible to put any filesystem with a block size >=
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2KB on such a disc. For example, it should be possible to do:
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# dvd+rw-format /dev/hdc (only needed if the disc has never
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been formatted)
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# mkudffs /dev/hdc
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# mount /dev/hdc /cdrom -t udf -o rw,noatime
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However, some drives don't follow the specification and expect the
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host to perform aligned writes at 32KB boundaries. Other drives do
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follow the specification, but suffer bad performance problems if the
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writes are not 32KB aligned.
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Both problems can be solved by using the pktcdvd driver, which always
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generates aligned writes.
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# dvd+rw-format /dev/hdc
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# pktsetup dev_name /dev/hdc
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# mkudffs /dev/pktcdvd/dev_name
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# mount /dev/pktcdvd/dev_name /cdrom -t udf -o rw,noatime
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Packet writing for DVD-RAM media
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--------------------------------
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DVD-RAM discs are random writable, so using the pktcdvd driver is not
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necessary. However, using the pktcdvd driver can improve performance
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in the same way it does for DVD+RW media.
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Notes
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-----
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- CD-RW media can usually not be overwritten more than about 1000
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times, so to avoid unnecessary wear on the media, you should always
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use the noatime mount option.
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- Defect management (ie automatic remapping of bad sectors) has not
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been implemented yet, so you are likely to get at least some
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filesystem corruption if the disc wears out.
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- Since the pktcdvd driver makes the disc appear as a regular block
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device with a 2KB block size, you can put any filesystem you like on
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the disc. For example, run:
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# /sbin/mke2fs /dev/pktcdvd/dev_name
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to create an ext2 filesystem on the disc.
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Links
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-----
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See http://fy.chalmers.se/~appro/linux/DVD+RW/ for more information
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about DVD writing.
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