On 05/09/2024 16:25, Thomas Schmitt wrote:
I let xorriso-dd-target use
bs=1M oflag=dsync
May too small bs value cause write multiplication if internal flash
erasure block size is much larger? I have seen claims that it can be
e.g. 12M
<https://superuser.com/questions/673847/if-i-align-a-partition-to-24mib-then-is-it-also-aligned-to-any-divider-of-this-s>
I have an impression that actual value is not exposed, so it is unknown
to kernel. My concern is wearing, I have no idea if firmware may perform
partial overwrites without apparent impact on speed.
Are you against "sync" command because it syncs all drives, not the
specific one (besides smooth progress report)? If USB mass storage
driver does not allow to turn port power off before write completion
then it might be a workaround. From my point of view, simple cp
suggested by the install guide is quite reasonable in comparison to dd.
Another my question is concerning reading of media and -x argument of
isosize. Is it really necessary? I can not figure out what corner cases
are not covered by "head -c BYTES /dev/sdc".
