Re: Block sizes for dd(1) to USB memory sticks (flash drives) for installers for FreeBSD

In reply to: Craig Leres : "Re: Block sizes for dd(1) to USB memory sticks (flash drives) for installers for FreeBSD"
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From: grarpamp <grarpamp_at_gmail.com>
Date: Sun, 02 Oct 2022 07:36:35 UTC

> 1MB ... 16kB ... 128kB ... etc

Different devices, media, drivers, interfaces.
With them, plotting different bs=2^n , n: 0~20 ...
will steadily both drop time and iops, and increase
bandwidth, tapering off to no further benefit,
often notably at the page size 8k.
Can also be seen with iozone, iostat, gstat, etc.
1M tended to be a handy streaming catch all.