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Some clarifications in wiki/QemuXorriso

This commit is contained in:
Thomas Schmitt 2011-11-11 17:27:52 +00:00
parent dc765c2eac
commit e26dcc7baf
1 changed files with 8 additions and 11 deletions
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19
doc/qemu_xorriso.wiki
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@ -20,15 +20,13 @@ qemu start command :
-net nic,model=ne2k_pci \ -net nic,model=ne2k_pci \
-net user,hostfwd=tcp::5557-:22 \ -net user,hostfwd=tcp::5557-:22 \
-hda /dvdbuffer/i386-install.qemu \ -hda /dvdbuffer/i386-install.qemu \
-drive file=/dev/sr2,if=none,id=scsicd \ -drive file=/dev/sr2,if=none,id=scsicd,format=raw \
-device virtio-blk,drive=scsicd,logical_block_size=2048,physical_block_size=2048 \ -device virtio-blk,drive=scsicd,logical_block_size=2048,physical_block_size=2048 \
-cdrom .../some_image.iso -cdrom .../some_image.iso
}}} }}}
With this setup of -drive and -device it is necessary to have a readable With this setup of -drive and -device it is necessary to have a
medium in the drive, when qemu gets started. Else it will refuse to start medium in the drive, when qemu gets started. Else it will refuse.
with a message about missing medium or with an i/o error if the medium
is blank.
The guest system is accessible via ssh and scp at port 5557 of the The guest system is accessible via ssh and scp at port 5557 of the
host system. host system.
@ -417,17 +415,16 @@ sessions contain ISO 9660 filesystem images, which successively
build on each other. build on each other.
So from the view of xorriso commands, the only task which makes So from the view of xorriso commands, the only task which makes
them differ from sequential media. is to apply optional formatting them differ from sequential media, is to apply optional formatting
to DVD-RW or BD-R. or re-formatting.
A special case are BD-R, which xorriso may format but will not bring A special case are BD-R, which xorriso may format but will not bring
into (pseudo-) overwritable state. Formatted BD-R perform Defect into (pseudo-) overwritable state. Formatted BD-R perform Defect
Management by default, which checkreads during writing and replaces Management by default, which checkreads during writing and replaces
bad block. Nice idea in theory. My practical experience is not so good. bad block.
Ill media stay ill media and should be replaced as soon as possible.
Formatting of unused DVD+RW and BD-RE is done by xorriso automatically. The mandatory formatting of unused DVD+RW and BD-RE is done by xorriso
Just start a normal write run. DVD-RAM are sold formatted. automatically. Just start a normal write run. DVD-RAM are sold formatted.
xorriso treats overwritable media with a valid ISO 9660 filesystem as xorriso treats overwritable media with a valid ISO 9660 filesystem as
appendable media. To make then writable from scratch, apply appendable media. To make then writable from scratch, apply