On Sun, Aug 03, 2025 at 11:58:59AM +0200, Nicolas George wrote: [...] > As Tomas pointed, with dd specifically you can use oflag=sync to have it > sync explicitly between each block, to get a better progress estimate. > Be sure to use a large block size or you will ruin performances. Oh, yes, forgot that one, thanks for mentioning. After some experimenting, I settled with bs=4M (note that this is for USB 3, and for some specific computer and stick, some experimenting pays off): it somewhat "flats off" beyond that point. The default, 512 bytes, is *definitely* too small: from there to 4M there was a factor of roughly 8 in troughput for me. So, as Nicolas says, throw in a "bs=4M" (or 1G or whatnot) into the mix. Cheers -- tomás
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