Dr. Hinner EDV wrote:
First of all Thank you very much for your work and your contribution!
You are welcome! :-)
I'm about to write a backup system, it should be energy-efficient and fast. [...] So I'd like to suggest to introduce a new option "--compare-before-write".
Given that writing can be slower on some devices than reading, this may be an interesting feature. It all depends on how frequently a block (or a sector) is overwritten with the same data.
But this is a significant change because ddrescue currently opens outfile write-only. So I guess it will have to wait until after 1.26 stable is released in a couple weeks or so.
I also wonder if SSDs do this check by themselves, in my opinion it would be smart to do because of wear, but it also takes some time.
I have no idea whether SSDs compare the data before writing it. (I tend to think they don't).
Happy new year to everybody! Antonio.
