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Some clarifications in wiki/QemuXorriso

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Thomas Schmitt 2011-11-10 19:55:48 +00:00
parent 89d1d91826
commit 8523e406c2
1 changed files with 7 additions and 7 deletions
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libisoburn/trunk/doc/qemu_xorriso.wiki
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@ -402,7 +402,7 @@ DVD+R, and CD-R. But you would waste two media by this.
The first session on CD will always be written with write type SAO, The first session on CD will always be written with write type SAO,
further sessions will be written with TAO. further sessions will be written with TAO.
All four media types have a simulation mode. It can be enabled by xorriso CD-R and DVD-R have a simulation mode. It can be enabled by xorriso
command -dummy "on", but of course it will not produce readable results. command -dummy "on", but of course it will not produce readable results.
So this simulation is usable only for first sessions on blank media. So this simulation is usable only for first sessions on blank media.
@ -416,21 +416,19 @@ multi-session usage model, under the assumption that all emulated
sessions contain ISO 9660 filesystem images, which successively sessions contain ISO 9660 filesystem images, which successively
build on each other. build on each other.
So from the view of xorriso commands, there is only the task of So from the view of xorriso commands, the only task which makes
getting those media formatted, which makes them differ from the them differ from sequential media. is to apply optional formatting
sequential media mentioned above. to DVD-RW or BD-R.
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 checkread 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. Nice idea in theory. My practical experience is not so good.
Ill media stay ill media and should be replaced as soon as possible. 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. Formatting of unused DVD+RW and BD-RE is done by xorriso automatically.
Just start a normal write run. DVD-RAM are sold formatted. Just start a normal write run. DVD-RAM are sold formatted.
De-formatting is only possible with DVD-RW.
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
-blank "as_needed", which will actually write a few bytes into the PVD -blank "as_needed", which will actually write a few bytes into the PVD
@ -439,6 +437,8 @@ appendable media. To make then writable from scratch, apply
There is no way to close formatted media. The command -close "on" There is no way to close formatted media. The command -close "on"
gets silently ignored. gets silently ignored.
De-formatting is possible with DVD-RW by -blank "deformat".
----------------------------------------------------------------------------- -----------------------------------------------------------------------------
Format DVD-RW for overwriting without intermediate blanking, Format DVD-RW for overwriting without intermediate blanking,